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[Q] Should I use Ni-MH battery to charge my senny?

Well I have came across many threads about Internal and external battery for Sensation and I know it's best to have an anker 1900mA or a Li-ion external battery.
However, I used 4 AA 2500 Ni-MH battery which can be found on Amazon: Eneloop XX 2500mA
I used a little device that can hold 4 AA battery and has a usb port which convert the voltage to ~5V and max current of 1A.
I wonder if it will damage my internal battery (currently HTC OEM) and will it give a good transfer of enegy between those battery compare with external li ion and internal li ion.
I know this is a complicated way to solve battery problem but I used to be iphone user so I cant change internal battery (which is crap), so suggestion of buying a new battery is appreciated but it will be more welcome if you can provide information that Im seeking.
Thanks for your time

Need some help with otg + charge mod

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
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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

Safe charging input

I have a modified USB port that can deliver about 4amps at the normal USB 5volts will that effect my phone if I charge from it? Will the phone suck to much power and damage the battery?
I'm assuming the circuitry to limit the battery from charging to fast or over charging is built into the phone and not in the charger?
Cheers guys

H_L said:
I have a modified USB port that can deliver about 4amps at the normal USB 5volts will that effect my phone if I charge from it? Will the phone suck to much power and damage the battery?
I'm assuming the circuitry to limit the battery from charging to fast or over charging is built into the phone and not in the charger?
Cheers guys
Click to expand...
Click to collapse
I don't think that the phone will suck up too much energy, but I'd advise you to be careful, because phone's circuitry was made to hold up to 3Amps (fast charging). If I were you, I'd absolutely try and then blame myself for whole life, what have I done if my phone died... But like I said. I cannot prevent you from doing it, but I can advise you not to. Keep me updated [emoji6]
Sent from Lenovo a6000 1GB version.

Bypassing the battery on Nexus 5

I'd like to know if there is a way to build an electric circuit to allow you to power up and operate a Nexus 5 without a battery attached.
I'd like to use the Nexus 5 as a "fixed" device, always on, always connected to the mains. Leaving the battery inside will cause it to age and eventually burst.
I'm guessing I could either try to feed the phone 3.8V (as the battery is rated), but I can't send the battery temperature values on its connector, or destroy the battery, remove the battery elements and leave the electronics in place and feed it current from there.
Before I break something, I'd like to ask if it has been done already.
Thanks!

-

inigo333 said:
Any success doing so? (inigo333 at gmail.com)
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Click to collapse
I haven't had time to try it yet, but a colleague suggested I try adding 2 diodes on the 5V line from USB to lower the voltage to 3.8V. I will plug this into the battery's circuit, replacing the other elements. I'll let you know when I get around to doing it (in a month or so).

Did it work?

Though it's been years - I haven't had time to try it
When I do, I'll probably go with one diode and supply 4.3V to the battery pins - because Li-Ion batteries can go to 4.3V...

Best solution for battery problem.
Attach 2 numbers of 18650 lithium cell of capacity 2200mah in parallel using smd type battery holder at the back panel.
Add an external li-ion battery charging module chip on the same side.
Take the internal battery's power management chip, discard the internal cell.
Connect externally attached battery power (+) & (-) ve to the internal power management chip of old battery.
Re assemble the mounted unit. Charge externally and enjoy.
Only problem is that, slim set becomes bulky.

Thanks,
But the problem is I wanted to run the Nexus 5 without a battery (from a charger). The goal being - it is always on, and there are no batteries to swell..

mad_ady said:
Thanks,
But the problem is I wanted to run the Nexus 5 without a battery (from a charger). The goal being - it is always on, and there are no batteries to swell..
Click to expand...
Click to collapse

The MT3608 2A Max DC-DC Step Up Power Module Booster Power Module is a low-cost module that can step-up a 2 to 24V input voltage up to a 5 to 28V output at up to 2A.
Use it inside the battery compartment.
Before installing preset output to 3.7-3.8 volt.
Fix it and use on dc 5 volt charger.

Which External Battery should we get?

I need to replace my current external battery with a faster charging option. Link below. During the day, my phone actually loses its battery while charging from the external battery and the phone gets quite hot. What should we get? Our phones are not capable Qualcom quickcharge 3.0. Has anyone bought an external battery?
This link is very similar.
https://forum.xda-developers.com/honor-8/help/phones-quickcharge-qualcom-quickcharge-t3611157
My current external battery. Doesn't charge fast enough.
https://www.amazon.com/gp/product/B01ABGVX58/ref=oh_aui_detailpage_o08_s00?ie=UTF8&psc=1

Get one that has the power delivery specification. It will charge faster and safer than QC3.
https://forum.xda-developers.com/honor-8/accessories/power-delivery-vs-fast-charge-t3618874