Hello guys ;
I didn't see anything like it , so i decided to make a guide for a portable charger.
This is especially handy if you have leftover batteries from old phones , you can't use them on your new phone but they still function. Why throw them away ?
Instead you can make a portable charger with it. Even AA ones will work. (Rechargeable recommended but not necessary)
You would pay 30-40 dollars for a portable charger with 5200 Mah capacity , What I'm offering is 12 Dollars for 7000 Mah Capacity.
So , It's practical , has a low cost , easy to make , has a high efficiency and if you have a little creativity it would look great.
First you need to understand the mechanics of a lithium-ion battery (Which we use)
It consists of a lithium ion solution , an anode and a cathode floating in the solution.
Lithium ions will move from negative (Cathode) to positive (Anode) taking electrons from lithium ions in the process , thus making it neutral.
This process is reversed by charging , delivering a desired current to lithium atoms will ionize the solution and making the neutral atoms , ions once again.
The current always flows from higher voltage to lower voltage , that's why the chargers are usually rated 4.8-5.0 volts in the chargers , instead of 3.7 like the battery.
If you use 3.7 volts in the charger the current will not flow , it will balance and it will not charge.
Dump charging means charging a battery at a higher rate than the phone allows by using batteries.
P920 will not accept currents higher than 1 amp so you will not be able to dump charge your battery using the charge slot , instead you will use the wires to connect the charger to your battery in the right polarity.
you will need to hold it by hand but no worries the process takes about 30 seconds to charge it from 0% to %50...
It decreases the life expectancy of the batteries so use it just for urgent matters.
So this is all you need to know so far as mechanics are the concern.
Prerequisites ;
Two batteries (Can be ordered from ebay , 3.7 volts 3500 mah , perfect for a portable charger) (You can use only one. In that case , skip the first step)
Insulated copper wires (Can be obtained or salvaged from anywhere , quality ones will improve the current)
A Step-up regulator (Can be bought from ebay , link will be given)
A custom made case (Optional , You can use electric tape to seal it instead)
A soldering iron
Solder
1. Connect the batteries in parallel ;
Take a copper wire and solder it to one of the batteries' negative terminal and to the other battery's negative terminal.
Take another copper wire and solder it to the positive terminal of one of the batteries and to the other battery's positive terminal.
Now you've wired the batteries in parallel.
It will not increase the voltage instead it will couple the "Mah" ratings and the current.
2. Take out the Step up regulator and wire it to the batteries in parallel ;
Take a wire and solder it to the negative side of the batteries in parallel (Doesn't matter which but we will use that battery one from now on.) and to the step-up regulator's negative side (It's marked on the pcb)
Take another wire and solder it to the positive side of the battery (the battery you just soldered the negative side to) and to the positive side of the step-up regulator.
And poof , you just made a portable charger.
You can connect it to your phone using the usb female output plug on the step up regulator.
Now it's time to make a case for it or you could just use electrical tape to seal it off. (That's what i did)
What we did (In short) ;
We wired 2 batteries in parallel and made the current 3.7 volts and 7000 Mah.
Then we used a DC to DC Step-up Regulator to increase the voltage to 5 volts to promote the flow of current from the charger to the battery.
Then we built a case to put the charger in or we used electrical tape to seal it.
Notes and Advice ;
Cut the insulation on the wires short , otherwise you can short-circuit the terminals. (Or use hot glue on them)
Take a drop of solder and drop it to the battery terminal using the soldering iron it's enough to make the wire stick to the terminal.
Coat the wires with solder before soldering.
The polarizations on the terminals are marked on the battery sticker. (The ones that are not marked are "Ground" terminals)
The polarizations on the step-up regulator are marked on the step-up regulator's pcb (Printed Circuit Board)
Do not short circuit the terminals , ever. (Use hot glue to make sure) (Optional)
You can use any DC battery rated 3.7 volts for this. They are as cheap as 2.50$ for a 3600 Mah rated one
If you don't use the step-up regulator , you will charge slowly and only when the battery on the phone has %30 or less charge remaining.
If you have a question , please ask.
If you have a webcam or video camera , i can remotely help you build it.
If you think i missed anything , leave a comment and i will edit.
I made mine before i decided to make this guide so i will not be providing a video for it , but the users of this guide are welcome to make a video for it , i can put it on my post.
With the links i gave , it costs about 20 dollars to make , it has a 7000 Mah rating more than any portable charger will give.If you use one battery it's 12 dollars. If you use other batteries on ebay it can cost as low as 9 Dollars for 7200 Mah rated charger.
The cheaper ones on the ebay will work just as well.
Links :
http://www.ebay.com/itm/3500mAh-Ext...522605?pt=PDA_Accessories&hash=item27c6c4faed (Extended battery and it's back cover)
http://www.ebay.com/itm/370718295020?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649 (Step-up regulator , rated 5 volts)
http://www.ebay.com/itm/3-6V-3600mA...802080332?pt=UK_Batteries&hash=item4609337e4c (A 3600 Mah battery 2.84$ great for it.)
Good Luck.
Cheers!
Um, why not just use the batteries as, well, spare batteries?
Sent from my LG-SU760 using xda app-developers app
LeighR said:
Um, why not just use the batteries as, well, spare batteries?
Sent from my LG-SU760 using xda app-developers app
Click to expand...
Click to collapse
Because it's more practical in so many ways than a spare battery when done.
If you don't want to do it , then don't.
But don't flood the thread with useless posts.
You think of "why nots" , i have plenty of those...
Sent from my LG-P920 using xda premium
boltthrower56 said:
Because it's more practical in so many ways than a spare battery when done.
If you don't want to do it , then don't.
But don't flood the thread with useless posts.
You think of "why nots" , i have plenty of those...
Sent from my LG-P920 using xda premium
Click to expand...
Click to collapse
Isn't it more practical to have a portable backup power supply? There are plenty of those, ho hassle, no ugly design...
Don't get me wrong, I'm also for DIY stuff, but just an idea...
BigBadSheep said:
Isn't it more practical to have a portable backup power supply? There are plenty of those, ho hassle, no ugly design...
Don't get me wrong, I'm also for DIY stuff, but just an idea...
Click to expand...
Click to collapse
First , things you make by yourself are more valuable than the ones you buy.
You cannot dump charge with the portable ones.
You'll pay at least 30-40 dollars for a 7000 mah power supply.
It doesn't have to be ugly , i'm planning to make a case out of mahogany , i'll post a picture, see if it is ugly.
Most important of all when you do it , you also learn and you don't throw it away when it is broken you fix it.
Well , to be honest i just wanted to give back to the forum that taught me so much , but now i understand why xbsall abandoned his work...
Sorry , i shouldn't have.
Sent from my LG-P920 using xda premium
Hey good job this is actually a nice idea cuz when am doing something important on my phone ..I use my phone alot for emails and such ..I wont have to turn off the phone and change batteries I just plug the charger and we can make it look nice with some creativity. Thanks alot for your work..keep it up.
Sent from my LG-P920 using xda premium
boltthrower56 said:
First , things you make by yourself are more valuable than the ones you buy.
You cannot dump charge with the portable ones.
You'll pay at least 30-40 dollars for a 7000 mah power supply.
It doesn't have to be ugly , i'm planning to make a case out of mahogany , i'll post a picture, see if it is ugly.
Most important of all when you do it , you also learn and you don't throw it away when it is broken you fix it.
Well , to be honest i just wanted to give back to the forum that taught me so much , but now i understand why xbsall abandoned his work...
Sorry , i shouldn't have.
Sent from my LG-P920 using xda premium
Click to expand...
Click to collapse
I must apologize. It wasn't my intention to cut off your enthusiasm. It's just the fact that now I'm a little...fuzzy and I didn't got the concept right. And yes, you are right in what you're saying about doing your own stuff.
Once again, sorry for being such a jerk. When you get your job done can we see some pictures, please?
Good Job boltthrower :thumbup::thumbup: .
We have a good physical here .
I used this method before with an old nokia dvice and with 6 volt 4 AH battery (too heavy) .
I didn't thought about the original battery .
Sent From My LG-P920 (ICS Ported)
Try Use THANKS Button If I Helped
OS_Hacking said:
Good Job boltthrower :thumbup::thumbup: .
We have a good physical here .
I used this method before with an old nokia dvice and with 6 volt 4 AH battery (too heavy) .
I didn't thought about the original battery .
Sent From My LG-P920 (ICS Ported)
Try Use THANKS Button If I Helped
Click to expand...
Click to collapse
Yeah this is especially handy if you have leftover spare batteries from old phones.
4 AH is really good for this , more the merrier
But if it is 6 volts you would need a linear regulator or a dc-dc converter like a 7805 , though making a dc to dc converter would be more efficient because 7805 will dissipate a quarter of the power as heat.
Sent from my LG-P920 using xda premium
Mate, I'm all for DIY stuff and think its cool you contributed, I just don't see the advantage over a spare battery, aside from not turning your phone off for 10 seconds.
If you find it useful, then that's great
Sent from my LG-SU760 using xda app-developers app
LeighR said:
Mate, I'm all for DIY stuff and think its cool you contributed, I just don't see the advantage over a spare battery, aside from not turning your phone off for 10 seconds.
If you find it useful, then that's great
Sent from my LG-SU760 using xda app-developers app
Click to expand...
Click to collapse
I don't need to justify my work to you. If you don't know why then read it plus the comments again or don't want it? Go away.
You're like an annoying pest , no matter how many you kill they always return.
Sent from my LG-P920 using xda premium
OK, if you've got nothing to contribute to the work by the OP then please don't post here as it's not useful to anyone. The OP made a decision to try make something themselves and share that back with everyone so let them continue and leave it at that.
Thanks
AvRS
I like to see such an invention here but isnt this the same like this:
http://www.ebay.de/itm/DUAL-Power-Bank-12000-mAh-iPhone-iPad-universal-externer-Akku-Tablet-Ladegerat-/310504817557?pt=Reiseaccessoires&hash=item484b878395
or this for 14 euro
http://www.ebay.de/itm/Mini-externer-Notfall-Akku-Mobil-Ladegerat-USB-Power-Station-5600mAh-f-iPhone-/160946292203?pt=DE_Handy_PDA_Akkus&hash=item25792585eb
p-vlad said:
I like to see such an invention here but isnt this the same like this:
http://www.ebay.de/itm/DUAL-Power-B...17557?pt=Reiseaccessoires&hash=item484b878395
or this for 14 euro
http://www.ebay.de/itm/Mini-externe...203?pt=DE_Handy_PDA_Akkus&hash=item25792585eb
Click to expand...
Click to collapse
It's cheaper if you make it yourself but even more so if you have old batteries lying around doing nothing.
Sent from my LG-P920 using xda premium
But isnt this method going to shortens the battery life of your.main battery?
Sent from my LG-P920 using xda app-developers app
p-vlad said:
But isnt this method going to shortens the battery life of your.main battery?
Sent from my LG-P920 using xda app-developers app
Click to expand...
Click to collapse
A very good question , i'll put it on the main post.
Not at all , it is no different than a wall charger.
The default LG wall charger for Optimus 3D P920 is rated 4.8 Volts with 1 Amp of constant current.
What we made should rate about 5 Volts and 1.5 Ampere of variant current.
Your Optimus 3D's charging mechanism will not accept currents more than 1 Amp so it will regulate it instead.
5 Volts will also be regulated by your built-in regulator to the optimum level which is 4.8 volts , a small difference that is.
sound nice. but as i know 5V by 1.5 A is 7.5W and 4.8 by 1 A is 4.8W. I am not sure but i would expect higher temperature during charging. And according to Li 3D to 2D structure it means shortening the life... As i remember 10 degree difference like 15 to 25 or 25 to 35 degree shorten the half life 1.5 times... well ofcorse this is only emergency process that you suppose (am I right?) and it is not made for every day use.,
ps. i am expert about the Li battery. maybe i am wrong.
p-vlad said:
sound nice. but as i know 5V by 1.5 A is 7.5W and 4.8 by 1 A is 4.8W. I am not sure but i would expect higher temperature during charging. And according to Li 3D to 2D structure it means shortening the life... As i remember 10 degree difference like 15 to 25 or 25 to 35 degree shorten the half life 1.5 times... well ofcorse this is only emergency process that you suppose (am I right?) and it is not made for every day use.,
ps. i am expert about the Li battery. maybe i am wrong.
Click to expand...
Click to collapse
You're partially right , it wouldn't however decrease the battery's lifespan because the output will be regulated to optimal levels before it reaches the battery.
Only way to decrease amps is to put some form of resistance in front of it , as it passes through the resistance it will dissipate the consumed current as heat.
So , the resistors will heat up (not by much) but not the battery.
It can be prevented however , by using a regulator with an output of 1A. (Can be found on ebay , radio shack)
Or a less complicated solution ;
A 3.7 volts and 3500 maH rated battery will produce around 945 mA of current , close to the wall charger itself.
So , instead of wiring batteries in parallel , you use one battery.
Another solution ,
Instead of wiring batteries in parallel , you wire them in series then use a linear regulator or a step-down regulator rated 5 volts.
Instead of your phone's resistors , the regulator will heat up
Another one ;
Don't use the Step-down regulator
It will de-promote the flow of current , you will get a really small amount of current that gradually increases as your battery's charge decreases.
However , it will not fully charge your battery , only keep it from going below a certain percentage.
In a good democracy , you never run out of solutions
Related
I tried plugging in my mini usb cables I have used for other phones but it does not fit. It looks like the opening on the MT is larger then the standard. Is anyone else noticing this?
I've used all my other ones fine. I use a blackberry mini usb to charge while I sleep, another blackberry cable to hook to my laptop at work, and the one that came with it at my home desktop. No problems for me.
All my chargers work fine as well.
It uses microusb, not mini. The standard ones work fine.
Sent from my myTouch_4G_Slide using XDA App
It's not the volts, it's the amps....
Just as an FYI, one thing to watch out for even though the USB plug is standard is that the power output can be different on different chargers. 5v is the USB standard, but the amperage can vary. I think the Max is 1A for the USB (2?) spec, but I'm not sure if or what the Min amperage is. The V/A output should be listed on the charger.
The plug that comes with the mt4gs is 5V-1A. When I've tried charging phones (e.g. Blackberry) in the past with a 5V-.2A charger, it has worked extremely poorly (half charge after 12+hours). I would expect similar results with the mt4gs.
websculling is right. Additionally, using the wrong amperage to charge significantly decreases the number of charges you get out of your battery before it fails. Stick to chargers that have the amperage the battery was optimally designed to accommodate.
_atlien_ said:
websculling is right. Additionally, using the wrong amperage to charge significantly decreases the number of charges you get out of your battery before it fails. Stick to chargers that have the amperage the battery was optimally designed to accommodate.
Click to expand...
Click to collapse
So amperage is what matters with USB charger compatibility and not the voltage?
My wife's old feature phone came with a micro-usb charger so I'm trying to figure out if it will damage by MT4GS or the MY3GS I handed down to my wife.
fallenturtle said:
So amperage is what matters with USB charger compatibility and not the voltage?
My wife's old feature phone came with a micro-usb charger so I'm trying to figure out if it will damage by MT4GS or the MY3GS I handed down to my wife.
Click to expand...
Click to collapse
Both are important.
Too high of a voltage and you'll burn up the battery or damage the charging circuit.
Too low of an amperage (blackberry chargers) and you'll wear out the battery much more quickly. Trickling in power like that to these kind of batteries that weren't designed to handle it that way 'ages' the cells and reduces their already less then impressive lifespan.
Battery tech is better then it was even a few short years ago, but these kind of batteries in this small of a package are barely efficient enough to be useful. A few more years and things will be a lot better, but for the time being you should really try to care for your battery as best as you can and not abuse it.
I'll post the link here to the XDA battery writeup I linked to in both the anker and mugen threads later on when I get back to a real computer and am not using a phone app to browse the forums.
(Because babysitting a door you just painted and can't close right away is such an engaging task...lol)
Sent from my Bulletproof_Doubleshot using xda premium
Blue6IX said:
Both are important.
Too high of a voltage and you'll burn up the battery or damage the charging circuit.
Too low of an amperage (blackberry chargers) and you'll wear out the battery much more quickly. Trickling in power like that to these kind of batteries that weren't designed to handle it that way 'ages' the cells and reduces their already less then impressive lifespan.
Battery tech is better then it was even a few short years ago, but these kind of batteries in this small of a package are barely efficient enough to be useful. A few more years and things will be a lot better, but for the time being you should really try to care for your battery as best as you can and not abuse it.
I'll post the link here to the XDA battery writeup I linked to in both the anker and mugen threads later on when I get back to a real computer and am not using a phone app to browse the forums.
(Because babysitting a door you just painted and can't close right away is such an engaging task...lol)
Sent from my Bulletproof_Doubleshot using xda premium
Click to expand...
Click to collapse
This particular adapter is 5.1V and .7A.
fallenturtle said:
This particular adapter is 5.1V and .7A.
Click to expand...
Click to collapse
That's not too far out of spec, but I would rather let my battery die then use it, personally. Finding an AC adapter that is in spec is very easy and very cheap.
Something to note here is the doubleshot does not have a hardware regulated charging circuit inside the phone - this is the reason why it was rough with the early unofficial ClockworkMod recoveries and the source of their charging issues.
Knowing there is no hardware failsafe, it makes it that much easier to do permanent damage to the battery, device or both.
Do what you think is best, but just want you to have as much information as possible to base your decision on.
Blue6IX said:
That's not too far out of spec, but I would rather let my battery die then use it, personally. Finding an AC adapter that is in spec is very easy and very cheap.
Something to note here is the doubleshot does not have a hardware regulated charging circuit inside the phone - this is the reason why it was rough with the early unofficial ClockworkMod recoveries and the source of their charging issues.
Knowing there is no hardware failsafe, it makes it that much easier to do permanent damage to the battery, device or both.
Do what you think is best, but just want you to have as much information as possible to base your decision on.
Click to expand...
Click to collapse
That's good info to know. Do you know if Espresso is also lacking that hardware failsafe?
fallenturtle said:
That's good info to know. Do you know if Espresso is also lacking that hardware failsafe?
Click to expand...
Click to collapse
Unsure - this is my first smart-phone, so I don't have the history of knowledge a lot of people don't realize they possess and am playing catch-up as quickly as I can.
I know a lot about this device, and the Nook Color, but anything else is pretty foreign to me at this time.
Blue6IX said:
Unsure - this is my first smart-phone, so I don't have the history of knowledge a lot of people don't realize they possess and am playing catch-up as quickly as I can.
I know a lot about this device, and the Nook Color, but anything else is pretty foreign to me at this time.
Click to expand...
Click to collapse
Since you're new to Android, download and read this guide.
Sent via smoke signal.
blackknightavalon said:
Since you're new to Android, download and read this guide.
Sent via smoke signal.
Click to expand...
Click to collapse
That looks like a pretty helpful download. I don't have any social media accounts anywhere, so sometime later on i'll subscribe to get the link.
Thanks, I really appreciate you sharing that!
http://forum.xda-developers.com/showthread.php?t=669497
XDA write up on these types of batteries - the link I said i'd drop in this thread before.
Sorry, been busy around here, trying to find time to clean up all my loose ends.
Hi guys,
My friend recently got a Note II. It comes bundled with official Samsung charger with output capacity of 5V ~2A. Just wanted to ask if it is safe to charge our phone using the high capacity charger?
Sent from my GT-I9103 using xda app-developers app
emanoj.i9103 said:
Hi guys,
My friend recently got a Note II. It comes bundled with official Samsung charger with output capacity of 5V ~2A. Just wanted to ask if it is safe to charge our phone using the high capacity charger?
Sent from my GT-I9103 using xda app-developers app
Click to expand...
Click to collapse
not sure but i would prefer you not to use it.
the higher current output would surely decrease he battery life.
your touchscreen might get messed up while charging (if that happens then surely don't do it)
and in worst case, the battery might blast...
I use an HTC charger (because of the very good and practical structure of usb cable and charger) the output of which is 5V and 1A compared to Samsung's 0.7A. Normally it will not brick your phone and it'll even charge faster because of the higher amount of electricity delivered through the cable. By the definition of performance (which is the energy delivered in a unit of time), you see that the higher the electric current is, the higher the performance is. I'm sure that the battery and device will heat up. So all in all, you can try it as the voltage output is the same, but be aware! And keep an eye on the temperature!
Sent from my GT-I9103 with CM10
Adam77Root said:
I use an HTC charger (because of the very good and practical structure of usb cable and charger) the output of which is 5V and 1A compared to Samsung's 0.7A. Normally it will not brick your phone and it'll even charge faster because of the higher amount of electricity delivered through the cable. By the definition of performance (which is the energy delivered in a unit of time), you see that the higher the electric current is, the higher the performance is. I'm sure that the battery and device will heat up. So all in all, you can try it as the voltage output is the same, but be aware! And keep an eye on the temperature!
Sent from my GT-I9103 with CM10
Click to expand...
Click to collapse
That is one hell of an analysis!:good:
Thanks a lot Adam. I'll try charging with an eye on temp.
Sent from my GT-I9103 using xda app-developers app
Lols.. I m surrounding with Sony, LG, HTC & my own Note 2 handset. but I usually charged from everybody's charger. But yes Adam did lots of research & as he said when I charge my mobile using Note 2 charger, it get charged fast then R's one. so, thinking to keep only Note 2 charger now.
Adam77Root said:
I use an HTC charger (because of the very good and practical structure of usb cable and charger) the output of which is 5V and 1A compared to Samsung's 0.7A. Normally it will not brick your phone and it'll even charge faster because of the higher amount of electricity delivered through the cable. By the definition of performance (which is the energy delivered in a unit of time), you see that the higher the electric current is, the higher the performance is. I'm sure that the battery and device will heat up. So all in all, you can try it as the voltage output is the same, but be aware! And keep an eye on the temperature!
Sent from my GT-I9103 with CM10
Click to expand...
Click to collapse
Are you a student of electronics / related branch by any chance ?
Woh Science ki taraf se hai...
Translation: He's from the science side...
Tapatalked from my Galaxy R GT-I9103 using XDA Premium App
I don't go to sleep until I utilize my quota of 8 thanx a day!
'cooleagle' said:
Are you a student of electronics / related branch by any chance ?
Click to expand...
Click to collapse
Here goes my observations, I used Note II charger to charge R. It does charge faster than the stock charger. Also, as adam said, phone got little heated up too.
Offtopic: I did my bachelors in electronics. I asked the question coz I didn't bother to know about hardware internals and wanted to know if there's some overcharge protection built in...
Thanked you for the thought about electronics. Cheers!
Sent from my GT-I9103 using xda app-developers app
No, I go to a class which specialises in maths and physics. I'm interested in electronics and do researches mainly in free time. It's one of the best parts of physics for me.
Sent from my GT-I9103
Dear XDA, i really need your help,
I am planning to make this (see thubnail)
i want to make a custom case for my htc one s. (I know it will be a little bigger but that's ok)
I want to charge my phone using a usb cable or a micro usb cable, and at the same time doing OTG. I don't know what resistor i will use yet (tips?)
Also add an extra battery. It is an old phone battery. So if i want to charge from the battery i need to stop the solar cell and guide the electricity through the 5v regulator to charge. What ya think?
I am new to modding so please comment cause i need a lot of help to make this one succeed!
Greetings, pro-one1000
sent from htc one s ville
Don't mean to be negative but I see a couple issues right of the bat. First, where are you going to get a 5 volt charger? I would guess most dc chargers are going to be 12, 24, or 36 volts. I don't think they'll run on significantly less. The solar panel is only going to output about one half of one watt. Assuming no friction loss or inefficiencies that would hardly slow your phone's discharge.
If you want to power the phone and hub I would suggest a small sealed lead acid battery. They're available in 12 volts in many sizes. Easily enough power to keep phone totally charged. Will work with cigarette lighter car chargers so you won't need to customize that part. Depending on the size it'll last a week to a month non-stop. Unfortunately, it probably won't fit in your pocket but if you carry a book bag or briefcase you could hide it there... I use a battery like this at work when I'm using a lot of phone battery and moving around too much to plug in.
Good luck with which ever route you choose!
Sent from my HTC One S using xda app-developers app
thanks
lampel said:
Don't mean to be negative but I see a couple issues right of the bat. First, where are you going to get a 5 volt charger? I would guess most dc chargers are going to be 12, 24, or 36 volts. I don't think they'll run on significantly less. The solar panel is only going to output about one half of one watt. Assuming no friction loss or inefficiencies that would hardly slow your phone's discharge.
If you want to power the phone and hub I would suggest a small sealed lead acid battery. They're available in 12 volts in many sizes. Easily enough power to keep phone totally charged. Will work with cigarette lighter car chargers so you won't need to customize that part. Depending on the size it'll last a week to a month non-stop. Unfortunately, it probably won't fit in your pocket but if you carry a book bag or briefcase you could hide it there... I use a battery like this at work when I'm using a lot of phone battery and moving around too much to plug in.
Good luck with which ever route you choose!
Sent from my HTC One S using xda app-developers app
Click to expand...
Click to collapse
Thanks for your reply!
First about the charger, i will use my 5v 1amp charger (micro usb) or an usb male to male usb cable from my pc to charge. So i'll be able to get a charger.
You're i think right about the solar panel, i need to find a better one indeed, trying to get one cheap on ebay! If i try to search for a "smal sealed lead acid battery" i get 40 dollar + big cases of batteries, could you please give a example in the form of an ebay-link?
Anyway thanks a lot and when i have ordered the parts i will try to upload the stuff!
Greetings
I'm assuming the 5v charger you're talking about it a car charger; which means it would have an input voltage of 12 - 14 and won't run on 3.7 (and even if it could run on the lower voltage the amperage would go up dramatically draining the usable power in the battery in minutes. And I wouldn't connect anything to a USB port for two reasons: first, if you connect two batteries in parallel (red to red and black to black) and they're not identical one will usually drain the other as they try and equalize (unless you isolate them from each other). Second, I don't think most USB ports (USB 3.0 i believe has provisions to receive power) are designed to receive power on a computer and your schematic doesn't include anything to prevent back feeding power to the computer.
There are many solar chargers I've seen that would give you the output you need - I've seen them designed to trickle charge RVs, boats, cars, and motorcycles - but I think they would be way to larger for what your looking for.
And I guess I should clarify what I meant by small... Was a bad choice of words for a cell phone forum, I guess. I meant small relative to other lead acid batteries; i.e. car or boat batteries. This is similiar to what I use:
http://www.ebay.com/itm/12VOLT-5AMP...US_Rechargeable_Batteries&hash=item589ef11aed
Attached is a pic of my batteries and the adapter that gives me a cigarette lighter type receptacle. And I use a spare motorcycle float charger to keep them charged. And because they're 12 volt batteries they'll power and accessory that is designed to run in a car.
I guess I should probably have asked what is your ultimate goal? And do you carry anything where you could stash the battery?
giesse1996 said:
Thanks for your reply!
First about the charger, i will use my 5v 1amp charger (micro usb) or an usb male to male usb cable from my pc to charge. So i'll be able to get a charger.
You're i think right about the solar panel, i need to find a better one indeed, trying to get one cheap on ebay! If i try to search for a "smal sealed lead acid battery" i get 40 dollar + big cases of batteries, could you please give a example in the form of an ebay-link?
Anyway thanks a lot and when i have ordered the parts i will try to upload the stuff!
Greetings
Click to expand...
Click to collapse
Thanks for your reply,
After thinking I want to use a second1-5 volt boost regulator attached a small high capicity battery of 3.7 volt. (like a galaxy sIII battery or something. So if i put the switch to on the extra battery should charge with 5v my phone battery. Or i could charge my phone directly from a high efficient solar cell with 5v.
I indeed have no idea how to prevent backfleeding. Do I need diodes / light emmitting diodes for this? And indeed the batteries you mentioned are way to big. I am planning to use an old battery from an other phone with the 5v boost regulator mentioned above. Further i don't understand where you see a computer in my scheme?
Your mod ( i think i it deserves that wonderfull name) with the 12v battery is a good idea. Very handy when going out without a charge point. I usually go to school and am probably able to put the large battery in there, but as i mentioned i want to keep it a "phone case".
My ultimate goal is to make the tiniest possible case for the htc one s ville with,
- a very small usb hub 4 port for 3 female ports and inside a micro sdhc memory for more storage.
- Add the charge ability, so i don't need to take the phone out of the case to charge
- be in otg mode and charging mode at the same time (i guess the hardest challenge)
optionary:
- Add a battery so when i get the actual phone out of the case the solar cell can keep providing power to the battery
- Add a solar cell
- make it actual work with multiple switches
Really appreciate your help!
Greetings,
I misunderstood "First about the charger, i will use my 5v 1amp charger (micro usb) or an usb male to male usb cable from my pc to charge" to mean you might have a computer available to charge. I guess you just meant the cable itself. Understood.
I'm not an electronics expert by any means but yes I believe diodes will prevent the current from flowing in an undesirable direction but they won't prevent one battery from draining another. Two batteries connected in parallel can drain each other and the diode will slow that but I don't think it will eliminate it. Might be able to mitigate the affect by opening one of your switches when the auxiliary battery is not in use. When two batteries are wired in parallel they are frequently connected to an isolator that has three terminals (for a two battery setup). Terminals one and two go to batteries one and two and terminal three goes to the system it's connected to. Batteries one and two never 'see' each other and therefore cannot affect or drain each other.
Not sure I have anything else that can really help... GOOD LUCK! And post pics and details if you build a working prototype.
Thanks again!
I'll try to order a couple extra diodes with low consuption, that plus the switches will hopefully do the job. I ordered yesterday the parts out of China, so it'll take a month to get it in my hands. Now I have more time to consider how it can be assembled all together, but if i get anything i will post it directly!! If it works i may try to make a tutorial for other people so they could also enjoy more ports on their phone!
Greetings
I guess you could consider a aftermarket charger a accessory....... so ive seen on here that every one is pretty satisfied with the 2amp charging speed on our phones, I had a 3amp charger (lost it) that I tried to charge my gs3 on and the battery got really hot. I wonder if a 3amp usp port would charge the gs4 faster?? Or just be a wast of money?
Sent from my SAMSUNG-SGH-I337 using xda premium
MattZ71 said:
I guess you could consider a aftermarket charger a accessory....... so ive seen on here that every one is pretty satisfied with the 2amp charging speed on our phones, I had a 3amp charger (lost it) that I tried to charge my gs3 on and the battery got really hot. I wonder if a 3amp usp port would charge the gs4 faster?? Or just be a wast of money?
Sent from my SAMSUNG-SGH-I337 using xda premium
Click to expand...
Click to collapse
Imo its a waste of money... I personally am still going to use my 850mA chargers in most cases, but Ill keep my 2amp nearby in case I need a quick 20% mid day
MattZ71 said:
I guess you could consider a aftermarket charger a accessory....... so ive seen on here that every one is pretty satisfied with the 2amp charging speed on our phones, I had a 3amp charger (lost it) that I tried to charge my gs3 on and the battery got really hot. I wonder if a 3amp usp port would charge the gs4 faster?? Or just be a wast of money?
Sent from my SAMSUNG-SGH-I337 using xda premium
Click to expand...
Click to collapse
S4 has a hardware limitation on charging current, right now it won't go above 1100mah while charging which is 1.1a, perhaps in future with kernel development we'll be able to raise the charging current but for now purchasing a charger above 2a would be completely useless.
Sent from my S IV (Octa Core Beast)
I mean most of the charging I do for my phone is when im asleep
Thanks for the replys. The information I needed.
Sent from my SAMSUNG-SGH-I337 using xda premium
Nasty_z said:
S4 has a hardware limitation on charging current, right now it won't go above 1100mah while charging which is 1.1a, perhaps in future with kernel development we'll be able to raise the charging current but for now purchasing a charger above 2a would be completely useless.
Sent from my S IV (Octa Core Beast)
Click to expand...
Click to collapse
On this point what you need to realize is that the usb cable loses a bunch of the power on the way... so like, a 3 foot cable might deliver most of the power to the phone ... a 10foot cable might only deliver 66% of it... so really a 2amp charger is whatthe s4 needed but going above it is kind of useless
The S4 actually goes to 1,910a when charging, I've checked with and app (galaxy charging current) that's why it charges so fast
Mine shows the same thing
duykhang524 said:
The S4 actually goes to 1,910a when charging, I've checked with and app (galaxy charging current) that's why it charges so fast
Click to expand...
Click to collapse
Do the lights dim everywhere in your house?
Oh and guys/gals, you cannot get around Ohm's law. 2A at 5V is 10Watts. You can use a 10A (50W) PSU but your phone will only use what it's designed to charge at unless you increase the voltage which I don't recommend unless you like to smell burned electronics.
Larger power supplies do have an advantage, however. You can charge multiple devices at the same time, i.e. a tablet, phone, spare battery, all at once. Good to prepare for a storm like we had last night here.
duykhang524 said:
The S4 actually goes to 1,910a when charging, I've checked with and app (galaxy charging current) that's why it charges so fast
Click to expand...
Click to collapse
Are you guys serious? I have the original charger from Samsung, mine charges at 1100 according to the same app
Edit: uh whoops..
Just checked, it says 1900 - sorry for the confusion
Sent from my S IV (Octa Core Beast)
cpufrost said:
Do the lights dim everywhere in your house?
Oh and guys/gals, you cannot get around Ohm's law. 2A at 5V is 10Watts. You can use a 10A (50W) PSU but your phone will only use what it's designed to charge at unless you increase the voltage which I don't recommend unless you like to smell burned electronics.
Larger power supplies do have an advantage, however. You can charge multiple devices at the same time, i.e. a tablet, phone, spare battery, all at once. Good to prepare for a storm like we had last night here.
Click to expand...
Click to collapse
10w is not a lot btw... My laptop pulls 60w on load and a hair dryer is 1000w... I mean't 1.9A sry for the confusion in french we use "," for the decimals in numbers
Nasty_z said:
Are you guys serious? I have the original charger from Samsung, mine charges at 1100 according to the same app
Edit: uh whoops..
Just checked, it says 1900 - sorry for the confusion
Sent from my S IV (Octa Core Beast)
Click to expand...
Click to collapse
1900 here for me as well, USB cords can also limit the current supplied, can only get this rate on a 6' (or less) my 10' and 15' each drop down quite a bit
duykhang524 said:
10w is not a lot btw... My laptop pulls 60w on load and a hair dryer is 1000w... I mean't 1.9A sry for the confusion in french we use "," for the decimals in numbers
Click to expand...
Click to collapse
Haha yes I figured, just being sarcastic, no harm meant.
I will add using this app I find interesting results of cable length vs. mA delivered. If you want to charge fast use a shorter cord.
I may connect it to a bench supply and see how it reacts to a gentle overvolt, say 5.5V. This could be what's needed to compensate for a longer cable, i.e. getting ~2A with a ten foot cable!
cpufrost said:
Haha yes I figured, just being sarcastic, no harm meant.
I will add using this app I find interesting results of cable length vs. mA delivered. If you want to charge fast use a shorter cord.
I may connect it to a bench supply and see how it reacts to a gentle overvolt, say 5.5V. This could be what's needed to compensate for a longer cable, i.e. getting ~2A with a ten foot cable!
Click to expand...
Click to collapse
Since the S4 is using QuickCharge from Qualcomm, I wonder if a generic 2A charger would affect charging time. http://www.anandtech.com/show/6914/samsung-galaxy-s-4-review/2
duykhang524 said:
Since the S4 is using QuickCharge from Qualcomm, I wonder if a generic 2A charger would affect charging time.
Click to expand...
Click to collapse
I'm guessing that this only applies to the GT-I9505?
Sent from my GT-I9500
guywhoeatsjello said:
I'm guessing that this only applies to the GT-I9505?
Sent from my GT-I9500
Click to expand...
Click to collapse
Yea
datrumole said:
1900 here for me as well, USB cords can also limit the current supplied, can only get this rate on a 6' (or less) my 10' and 15' each drop down quite a bit
Click to expand...
Click to collapse
Just a thought but what about a 10ft+ cord with a 3 amp charger? I wonder if the 3 amp will bring up the charging?
Sent from my SAMSUNG-SGH-I337 using xda premium
cpufrost said:
Do the lights dim everywhere in your house?
Oh and guys/gals, you cannot get around Ohm's law. 2A at 5V is 10Watts. You can use a 10A (50W) PSU but your phone will only use what it's designed to charge at unless you increase the voltage which I don't recommend unless you like to smell burned electronics.
Larger power supplies do have an advantage, however. You can charge multiple devices at the same time, i.e. a tablet, phone, spare battery, all at once. Good to prepare for a storm like we had last night here.
Click to expand...
Click to collapse
The currents which we're discussing when charging apply from the phone to the battery which subsequently uses the battery voltage as a charging indicator. Those 1.9A only happen at low battery percentages with voltages around 3.6V or lower, with raising voltage the current is limited. This is basically what QC quickcharge is. I don't really see the gimmick in it, as such a logic could be emulated in software on any phone.
Moved from general sorry
I just bought a Anker 24W / 4.8A Dual-Port Car Charger. I bought this to replace a cheap $2 charger that I did not want to use on my nexus 5
I just tested the anker charger and it puts out 5.24v-5.29v. I know that does not sound like much but all my other chargers AC wallwarts, and even the cheap $2 car charger all put out 4.95v-5.02v.
Should I go a head and use this anker car charger or should I return it? Thanks.
That's just how much the charge puts out. The phone may not accept that much input.
Sent from my SAMSUNG-SGH-I337 using xda app-developers app
Typically there is a boost/buck or other relatively efficient voltage regulator in the phones that manages the battery charging, so the 5% "over-voltage" that you are seeing shouldn't be an issue.
I'm guessing you measured that with no load -- most wall-warts run a little high without load, and then a little low at full load, so they can claim good regulation (+/-5%, for example) and a high current capacity. The change is due to internal resistance of the supply, something that you can compensate for, but can't ever get rid of.
LZLandingZone said:
That's just how much the charge puts out. The phone may not accept that much input.
Sent from my SAMSUNG-SGH-I337 using xda app-developers app
Click to expand...
Click to collapse
Only when talking current. Voltage is completely different.
jeffsf said:
Typically there is a boost/buck or other relatively efficient voltage regulator in the phones that manages the battery charging, so the 5% "over-voltage" that you are seeing shouldn't be an issue.
I'm guessing you measured that with no load -- most wall-warts run a little high without load, and then a little low at full load, so they can claim good regulation (+/-5%, for example) and a high current capacity. The change is due to internal resistance of the supply, something that you can compensate for, but can't ever get rid of.
Click to expand...
Click to collapse
Thanks,
No I measured with a load. I have a voltage current usb meter.
http://dx.com/p/usb-av-usb-power-current-voltage-tester-translucent-blue-silver-235090#.Uu2NRXddWLc
I just did another test. This time with my phone almost at 95% full. I got 5.33v while sucking down 332mha.
Im sending it back. I tested every charger brick and several other devices in my home. nothing came even remotely close to 5.3v
USB specs are 5.0v +-0.25% so I should see no more then 5.25v.