[Galaxy S II Android Development] tha_G:
Hi all,

I see the same questions passing by about battery-drain, new battery...

I faced similar battery-drain and got especially frustrated about the unreliable battery percentage indication.

You know, it says you have 60% left and after a reboot you only have 15% left and no charger at hand.

Nothing new but I managed to get rid of this frustration and increased battery life a bit, without using or installing an app.

I followed the steps indicated in how-to-calibrate-the-battery-on-your-android-device on androidpit (sorry can't add a link just yet)

I used my phone until it turned itself off

Next morning I plugged the charger in and it showed a percentage of more than 50% -> magically recharged half the way... ;))

I immediately plugged the charger out again and booted my phone, it indicated like 20%.

After this I followed these steps

1. Discharge your phone fully until it turns itself off.

2. Turn it on again and let it turn itself off.

3. Plug your phone into a charger and, without turning it on, let it charge until the on-screen or LED indicator says 100 percent.

4. Unplug your charger.

5. Turn your phone on. It's likely that the battery indicator won't say 100 percent, so plug the charger back in (leave your phone on) and continue charging until it says 100 percent on-screen as well.

6. Unplug your phone and restart it. If it doesn't say 100 percent plug the charger back in until it says 100 percent on screen.

7. Repeat this cycle until it says 100 percent (or as close as you think it's going to get) when you start it up without being plugged in.

8. Now, let your battery discharge all the way down to 0 percent and let your phone turn off again.

9. Fully charge the battery one more time without interruption and you should have reset the Android system's battery percentage.

It was interesting to notice that it took like 5 hours or more to completely charge in step 3. (Before it was way faster)

So what did improve?

- The discrepancies of the battery charge indication between boots or with phone on and off are gone.

- The charging time is longer than before and therefore the uptime improved a lot (I estimate the uptime somewhere between 3/2 to 4/2 compared to before)

On average my phone last close to 2 days (CM13 wifi on all the time, fairly light usage, daily browsing, reading the news, an incidental game... I do not have google+ installed because it drains to much energy, or at least it did like one year ago)

Note, this is still with my original 4-5 years old battery

I hope this helps some of you.

Try it out and let us know about your experience.

By the way:

I'm convinced deleting batterystats will never "really" help you, no harm in trying though.

About replacement batteries,

Once in a while I read things like "I got a battery with 2450mAh and it is equal in size..."

If you use common sense, this is impossible, Li-ion technology has not fundamentally changed over the years. While an increase from 1650 to 1800mAh might be possible, any increase above that is just "highly suspicious".

If you ask me, if you really have battery problems and the above does not solve things?

-> by a new stock one or the bigger battery with new backcover.

I'm a long time follower of all the I9100 xda threads but this is my first post here

What about that, kind of a big read no? ;)

Grtz, G