egzthunder1 · Oct 20, 2010 at 12:15 am

Tweaks for Superb Battery Life in EVO

If you are an EVO user, you are probably aware of a little problem that haunts this device. Battery with most roms is less than optimal. There have been many roms, kernels, and theories that have managed to increase this important aspect of our devices (lower brightness, turn off data/GPS if you are not using it, kill 4G, etc). These are all good solutions that will make your device go on a power diet and will allow you to have enough juice to plug it in the charger at night. However, isn’t doing all this defeating the purpose of having such a feature rich device? Point and case, when I got my EVO and activated it, I had to call Sprint and for the first time in about 10 years of using pda devices, I was told that I needed to turn stuff off for it to last roughly a full day. Not a good first impression considering that I can still get almost a week out of the charger with my old Blue Angel (my extended battery is almost 5 years old).

In this small compilation article, we will show you the best tips and tweaks to save juice for your EVO. I take no credit for any of these as they have been discovered, put together, and otherwise created by many of our talented devs and members. This is just to put them handy, so that every member can benefit from them:

Calibrate the Battery

Basically, the EVO’s battery is not exactly optimized to give the best out of it. However, there is something you can do. Just like calibrating the screen, performing this process for the battery will improve its efficiency. This is a simple process that will only take a few minutes:

Preparing…
With the phone in the on position.
Fully charge the battery with the phone on… (until the led turns green.)
Once the led turns green, unplug the charger until the led goes off.
After the led goes off, plug the charger back in. When the led turns green , power off the phone.
now…. with the phone fully powered off…

1. Unplug the charger.
2. Wait until led goes off.
3. Plug charger back in until the led turns green. When it turns green, unplug the charger again and go to step 1.
4. repeat steps 1 and 3, 10 times. This may take anywhere from 30 seconds to 30 mins per cycle. Typically only about 1 minute. though.

Thanks kthejoker20 for this. You can find the original guide here.

Clear Battery Stats

After flashing any rom, it is a good idea to reset the stats which are automatically saved by the device. This is an easy thing to do.

  1. Charge your device fully;
  2. Pull the charger and go into recovery (Amon_RA or Clockworkmod are both fine);
  3. Once in Recovery, go to Advanced > Clear Battery Stats and choose “yes” when prompted.

Simple, huh?

Kernels, kernels, kernels…

The magic word for most Android roms seem to be kernel. Unfortunately, there is no clear evidence that there is a combination better than another. However, there are roms that combined with certain kernels can give you superb battery life. Again, this is very dependent on the rom and the kernel combination, so if you were not used to flashing before this… you will be now. A personal favorite is myn’s Warm TwoPointTwo RLS2 combined with King BFS kernel #9. Moderate usage on this combination (games, browsing, calls, market, etc), and I can easily get a full day out of the battery without running for the closest outlet.

You can find myn’s rom thread here.

Collin_ph Battery Tweak

Saved the best for last. Hero owners may be familiar with this, but for those who aren’t, there was a tweak released not too long ago by XDA member collin_ph, which basically controlled the device’s hardware to optimize power consumption. I will not bore you with all the technical details (most of which are above and beyond end users anyways), but many Hero owners had reported that by applying this fix, they could get well over 30 hours of moderate to heavy use without having to charge. Why is this relevant for the EVO? XDA member myn has successfully ported the code to run on the EVO, and has been kind enough to share his findings with the rest of the community, so this can be implemented with various roms and kernels.

You can find more information in myn’s fix thread or in collin_ph original thread.

Final Pointers

There are things that you can use to improve your battery life without having to do all of the above…

  • If you are not using 3G/4G, turn them off;
  • Turn off GPS if you are not using it;
  • Lower the screen brightness to the lowest possible that you will be comfortable using;
  • Try to use black backgrounds, as black colors will basically mean that the pixels are off in the screen, thus, consuming less power;
  • Use throttling software such as SetCPU to lower the devices power requirements when it is idle.

We sincerely hope that this guide will help in getting your device to be mobile one more time and not be fixed to a wall.

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