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Hi All,
Couldn't find this posted before so wondered if anyone could recommend a USB Battery Charger to change the batt from my Desire without the phone. I have a spare and going on travels want to be able to just leave the battery charging on its own and not use the phone all the time.
Ive seen quite a few on ebay and some look really dodgy with adjustable charging pins etc whereas others are ridiculously cheap and i can only imagine will ruin my battery.
Key points are it should be small, light, USB powered and whilst I accept it will not charge as good/full as through the phone - not to knacker my batt completely.
Cheers for any help.
Bridgstfer
I have been looking for the same thing and found a battery pack on Amazon for £25, manufactured by New Trent it has a 5000mAh battery in it and can recharge your phone at least 3 times.
I ordered the dual output version on Sunday, so hope to get it and try it out in a couple of days.
Using a Veho pebble here, works great
would be nice for a faster charge though, it seems a bit slow for 750ma
mps711 said:
I have been looking for the same thing and found a battery pack on Amazon for £25, manufactured by New Trent it has a 5000mAh battery in it and can recharge your phone at least 3 times.
I ordered the dual output version on Sunday, so hope to get it and try it out in a couple of days.
Click to expand...
Click to collapse
I've got one of those. It's really good, one of the outputs is 1A so charges up really quickly.
My only criticism is the on/off button is easily pressed by accident, but that's really looking for problems. Oh and it would have been nice if the usb socket to charge it was a microusb one so I could use the same lead as the phone.
It's a good battery pack.
It certainly sounds like it is going to be good.
With regards to charging the pack itself, does it come with a USB to mini USB charging lead?
mps711 said:
It certainly sounds like it is going to be good.
With regards to charging the pack itself, does it come with a USB to mini USB charging lead?
Click to expand...
Click to collapse
Mine didnt come with any charger or leads but as I have a box full of that stuff it wasn't an issue.
Edit: I'm an idiot. It came with a lead with a selection of interchangable tips to fit most phones.
I forgot as this is now also living at the bottom of my tangled box of leads.
Thanks for the replies guys.
Yeah i actually had one of those external battery packs (5000mah) but found that you could not even get 2 full charges out of it and therefore not worth the extra weight/charge time.
Basically its misleading because the voltage of the battery is different to you phone battery and it need to be upscaled or something - there are quite alot of posts about it. Let us know if you manage to get 3 charges though - that would be good.
But anyone used external chargers for the a spare phone battery?
Someone knows any Solar charger that really works with HTC Desire?
I look in www.dealextreme.com but I don't know how many "Amp" need the desire.
all solar chargers i've found so far had an 80mAh ouput.
a usb charger has an 500mAh output and charges slowly around 4-6 hours? (never tried to charge it full via usb).
a wall charger has up to 1000mAh and charges the phone in 1-2 hours.
so i guess it takes the solar charger virtually forever to charge your phone once
Yeah, generally you want a charger with high output (at least 500 mA) and a high capacity (at least the same as the desire battery, which is 1400 mAh). Once you're sure about those two factors, you're safe.
I'm using the powermonkey explorer: Link
Output: 700 mA
Capacity: 2200 mAh
On a sunny day, I'm able to reach the maximum charge in one day (10-12 hours sun). Note that the output from the solar panel to the powermonkey battery is a lot lower, more like 200 mA. And a full charge should, in theory, give your phone 1 and a half charge. In reality it's more like 1 charge, which is still fine.
It might be a bit more expensive, but it actually works.
veitograf said:
all solar chargers i've found so far had an 80mAh ouput.
a usb charger has an 500mAh output and charges slowly around 4-6 hours? (never tried to charge it full via usb).
a wall charger has up to 1000mAh and charges the phone in 1-2 hours.
so i guess it takes the solar charger virtually forever to charge your phone once
Click to expand...
Click to collapse
heh good point !
if you ever find a solar charger post it in this post where you've got it from would love to try this lol
http://uk.gizmodo.com/5584810/joos-...viewed-solar+powered-gadget-charging-for-real
Gizmodo reviewed this charger a while back. Quite tempted to buy it myself
http://www.solarjoos.com/
http://www.dealextreme.com/p/solar-...ncy-power-with-phone-adapters-led-light-42139
http://www.dealextreme.com/p/1000mah-solar-powered-battery-pack-with-cell-phone-adapters-42871
These two work with desire?
Which would you choose
To use it effectively you need to use a solar charger with built-in battery.
E.g. I got an Energy Trends ET-3000:
http://www.energy-trends.eu/et-3000-solarladegeraet-iphone-handy.htm (maybe use google translate) 330mA solar power, 3000 mA battery, 1000 mAh can be loaded within 3 hours in direct sunlight
Can also be combined with this:
http://www.energy-trends.eu/et-2-solarladegeraet-rucksack.htm for hard survival tours ^^
Arctic C1 mobile
I found this charger: arctic.ac/en/p/power/batteries/44/arctic-c1-mobile.html?c=2224 which I quite like, but
the question is: would the 5.5v output "fry" my HTC?
I tried a 3rd party usb power adaptor, which outputs 5.3v as opposed to the genuine HTC adaptor (5.1v) and the phone can't be used while it's charging.
Literally the phone becomes so unresponsive, that it's impossible even just to slide the keylock! The minute I put the phone back onto the genuine HTC usb adaptor, everything works fine and I can use the phone while it's charging.
So here is the second question: has anyone experienced this?
bliblablub said:
To use it effectively you need to use a solar charger with built-in battery.
E.g. I got an Energy Trends ET-3000:
http://www.energy-trends.eu/et-3000-solarladegeraet-iphone-handy.htm (maybe use google translate) 330mA solar power, 3000 mA battery, 1000 mAh can be loaded within 3 hours in direct sunlight
Can also be combined with this:
http://www.energy-trends.eu/et-2-solarladegeraet-rucksack.htm for hard survival tours ^^
Click to expand...
Click to collapse
this one looks excelente,like germany tanke.
i dont think thats a good gadget. the usb charger does not load the desire complete full and the accu is really fast empty.... so i dont wanna buy such a gadget.
Could be so interesting for long travels
Looks interesting, if someone could share his experiences about it!
I would be gratefull
nava88 said:
http://www.dealextreme.com/p/solar-...ncy-power-with-phone-adapters-led-light-42139
http://www.dealextreme.com/p/1000mah-solar-powered-battery-pack-with-cell-phone-adapters-42871
These two work with desire?
Which would you choose
Click to expand...
Click to collapse
works?? Have you bought anything? Thanks
So I was wondering if I could find the original G2 wall charger, the one that came in the box. I bought my phone from craigslist and that guy didnt have the charger for some reason. I've been using some motorola one and very happy with it cause it didnt have rapid charging and battery life was great too (not sure if the charger plays a role). But couple weeks ago the wire got loose and wouldnt connect properly, so I bought this: http://cgi.ebay.com/ws/eBayISAPI.dl...331986&ssPageName=STRK:MEWNX:IT#ht_1184wt_950
Ever since I've been using that my phone goes to 100% from 10% in two hours, and battery life has been bad too since using that. I have used the phone the same was as before, I even calibrated it again, tried it with setcpu and no setcpu, used edge only also, tried different roms, used just wifi only etc, and battery life still not same as before. I mean it has to be the charger right? Otherwise it wouldnt have made a difference in using a different one. So I'm trying to find opinions from you guys to see if I can find the original one ( I have no idea what it looks like) or a similar one from ebay/amazon. Thanks for reading!
What is the rated Output on the charger that you have? The stock one is supposed to put out 1 Amp (1000 ma). It isn't uncommon for it to go from 10 to 'full' in 2 hours, but just because the phone shows it full, doesn't mean its there. Are you charging overnight or just for that 2 hour period?
Yes I am charging overnight. Output says 5V, 1A, so I'm guessing thats 1000ma/1Amp?
The G2's cord is rounder at the USB end and the Plug- in end, but I would think it would not make a giant difference since I use a Motorola one since I don't know where my original one went.
OEM HTC charger
I'm not sure if your still looking, but i bought a Brand New OEM HTC charger from eBay. It was the same thing that came with G2. I'm pretty sure by the time you see this it will be sold but they list them everyday so just look at the sellers other items.
Since I'm a new user i cant post links, but the item number is 160619103766
http://web50-shopamerica.htc.com/accessories/accessory_result.htm
quierotacobell said:
Output says 5V, 1A, so I'm guessing thats 1000ma/1Amp?
Click to expand...
Click to collapse
That is the maximum current supported by the charger, but the device may request a lower current. Use something like Battery Monitor Widget or Current Widget to see how much current is actually being drawn over the USB port. The most accurate reading will be taken when the screen is off, the CPU is idle and underclocked, all radios are off, etc.
I had a cheap no-name AC adapter for my DZ, but it caused the touchscreen to go bonkers. I ended up buying one of these adapters:
http://canadacomputers.com/product_info.php?item_id=039726
Inexpensive, and having two USB ports is very convenient. One goes to my Mugen DZ charging cradle (phone + spare battery), the other to my BT headset. Any standard USB cable will work. It does not cause problems with the touchscreen, so I can continue to use the phone even while it is charging.
The best I've seen on a DZ is about 650 mA net charge, which means an empty 1800 mAh battery should be fully charged in about 3 hours.
I've seen logs of my dz charging at 680-780mA, so long as you have a 1A output charger it should charge the same. The output is the max rated output, not what its feeding to the phone to charge.
On that note most moto chargers I've seen are 700mA max out and same with a lot of samsung chargers I've owned. I use my original that came with my g2 as well as an old htc diamond wall charger with a sony usb cable lol, I get the same charge from both.
Sent from my HTC Vision using XDA Premium App
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
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