Replacement battery with bigger capasity

[Doman]

I've tried this Android Tuner from 3c but it doesn't work as I need. You can enter any capacity manualy, but it is just a monitoring tool. It does't change the capacity seen by the phone so the battery still works in "2 stages".

Any other ideas or solutions?

 

[John_Edward]

I would like to add some laws of physics to this issue, namely the the energy density of a LiPo battery.
The OEM battery is a 3.8V 1900mAh battery (7.22Wh), it measures 51 x 69 x 4.2 mm and weights 33 grams.

According to wikipedia, the enery to weight ratio of Li-ion is 100–265 W·h/kg, and the volume one is 250–730 W·h/L, which give us 8.75Wh and 10.79Wh, respectively.
As the battery does have additional components, a case, and rounded corners, you can see that the 7.22Wh isn't too far off from 8.75Wh.

A 2850mAh battery would have a 10.83 Watt hour rating.
So while the capacity itself is not impossible, it would be top of the line technology, which I very much doubt the 4$ cheapo would be.
If you actually want a bigger battery, you either have to pay premium, or actually get a physically bigger battery.
If it is twice as thick, you get a limit of 21.6Wh, or 5700mAh.


And then a top tip for all of you buying batteries; Buy from eBay, measure how much capacity it actually has, and if it isn't what you brought, they sent you a defective product and you can demand a replacement or your money back.
They might ask you to return it; usually the shipping cost is higher than the product itself.
If so, demand a partial refund for the 'missing' capacity.
Just make sure the that the description is clear and nowhere does it state 'manufacturer claimed capacity' or somesuch.

 

[Doman]

Here is my translation for the workaround:

Edit the following file in the kernel source "drivers/power/pm8921-bms.c" as following:

In the function "calculate_fcc_uah" you have to paste
/* fixme: powerakku has the double capacity */
scalefactor *= 2;
at
"scalefactor = interpolate_scalingfactor_fcc(chip->fcc_sf_lut,
chargecycles);"

then build the kernel and update the "bootimg" (with abootimg) with the new kernel and flash it then via dd to "/dev/block/platform/msm_sdcc.1/by-name/boot"

Reboot your Device.

You should calibrate the battery with an app from the market (first discharge your battery (<10%), then delete "/data/system/batterystats.bin" , reboot and charge to the fullest.

Do you think you can make a step by step tutorial how to do this kernel modification? I still haven't cope with this extended battery issue

 

[junkyde]

nope sorry, I have no time for that.

 

[Doman]

Fair enough, thanks for reply.

Anyone else maybe?

 

[junkyde]

So I had time to compile some extended battery versions of my vikinger stock 4.2.2 kernel for you guys

There are 3 versions available: 3800mah, 4275mah and 6333mah for the lte and 3g variant of the s4 mini.

You can check the expected battery capacity with adb shell or with the terminal app:
"cat /sys/class/power_supply/battery/energy_full"

it should be "1940000" with the stock kernel and after flashing one of my modified kernels it should be higher.

So here are the download links:
GT-I9195: 3800 4275 6333
GT-I9190: 3800 4275 6333

After flashing the kernel you should calibrate your battery with an app from google play store.
(so discharge below 10%, then delete "/data/system/batterystats.bin", reboot and charge to 100%)

Let me know if it works for you guys.

 

[VladimirZagreb]

This moded kernel is working great! It gives me about 20 hours of CONTINUOUS web browsing! More then three times then before. I have GT-i9515 and 6500 mAh extended battery.

 

[Doman]

it should be "1940000" with the stock kernel and after flashing one of my modified kernels it should be higher.

It gives me 70032704 with 4275mAh version... is that correct?

I'm after flashing. Appreciate a lot I'll give feedback after some testing. So far I'm also happy I got button LED notifications bonus

 

[kamikaze702k]

Any support for 4.4.3 / 4.4.4 ROMs ?

Sent from my GT-I9195 CarbonKat 4.4.3

 

[junkyde]

It gives me 70032704 with 4275mAh version... is that correct?

hmmm.... it doesn't seem correct, but maybe just use it for a while and test it. Or flash and test the 3800mah variant. Also please tell me the adb output on this.

Any support for 4.4.3 / 4.4.4 ROMs ?

no kernel source released for 4.4.x yet.

 

[Doman]

OK. So I've flashed 3800mAh kernel version. Now terminal gives me a value of "-414967296". Yes, with "minus" in the front Is that correct?

I've decided to try with 3800mAh, because with 4300mAh I've encountered some battery percentage jumps and drops. While charging it was very steady up to ~75%, then very quick up to a 100%. And the other way discharging was fluent up to ~20-30%... and after that quick percentage drops as well as phone reboots.

I'll see how this 3800mAh works for me now.

 

[junkyde]

that's strange...

 

[kodyro]

Just found very cheap 2500mAh battery any one have tried one of those? I am very doubting about its quality..

 

[Doman]

The original battery is 1900mAh. Plus it is probably measured and confirmed capacity.

So I don't think it is worth to go with 2500mAh as a replacement. Even if the capacity is true you won't gain much more time on it. Especially for that price I'd suggest to go with much bigger size, not only on label but in physical dimensions also.

 

[dekar123]

6200mAh Extended Battery for s4 mini GT-I9195 is safe this battery for this model?

Anyone tried???



http://www.ebay.com/itm/New-6200mAh...040?pt=LH_DefaultDomain_3&hash=item1e8c337b60

 

[Doman]

Should be safe, as long as you don't throw the phone with it, coz it must be heavy :laugh:

Don't expect it to have that much capacity, but still much more than the original one. You can count on that by the dimensions only. It won't harm your phone. It will just take longer time to be charged.

 

[abj2aqua]

So I found this one
http://www.tvc-mall.com/details/Whi...mini-i9190-6200mAh-EU-Version-BATY-I9190-04B/
Just wanted to know if its safe to use these batteries.. you know.. not going to blow up in my face or anything?
Hope so. Please confirm
Thanks

 

[phz.]

Cheap batteries "generally" have a higher risk to die early because there are less resources used to design them. Heat management always can be a problem for electronic devices. You should care about the CE mark to stay on the safe side, everything else is personal interest. I prefer reducing the energy consumption and having a second battery as backup.

Sent from my GT-I9195 using XDA Premium 4 mobile app

 

[abj2aqua]

Cheap batteries "generally" have a higher risk to die early because there are less resources used to design them. Heat management always can be a problem for electronic devices. You should care about the CE mark to stay on the safe side, everything else is personal interest. I prefer reducing the energy consumption and having a second battery as backup.

Sent from my GT-I9195 using XDA Premium 4 mobile app

So my using this extremely cheap yet high capacity battery will not be dangerous to either my phone or me? Because thats what I was concerned about after reading articles of people with fake low quality batteries having them blow up in their face while on a call or charging or ****

 

[Doman]

No one is gonna give you such a warranty or promise. There is always a higher risk. Even original well known brand batteries use to blow up. But I would not worry in yor case.

I've been using 3rd party batteries many times. The battery you ask is bigger in capacity, but also bigger in size, which is good coz it is not overloaded.