How to undervolt your nexus 4 and get 25 percent more battery life

There are a lot of ways to increase your Nexus 4’s battery life. Traditional methods of power saving include dimming the screen, turning off vibration and disabling background data, but all of these take features away from your phone. The process of undervolting — lowering the amount of power your phone can consume — provides yet another way to increase its battery life. Undervolting your Nexus 4 is a major phone hack which carries risks with it, including the risk of breaking your phone and the certainty of voiding its warranty.

14. Scroll down and click the Apply button to save the changes. Enjoy the extra battery life! (I don’t recommend select Set on Boot simply because you could get stuck if the voltage is too low, so just redo steps 12 and 13 anytime you reboot your device.


Trust me it’s safer this way).

*If you have an issue where the device won’t reboot properly or turns itself off, simply flash this file via recovery the same way you flashed the undervolted kernel to reset the kernel to stock and be able to reboot the device. IV. The Results

David Cogen is a founder of TheUnlockr.com, the popular site for rooting, jailbreaking, hacking, modding, and other how tos to show you how to unlock your device’s true potential. They even have a popular ROM repository. Check out TheUnlockr.com for all your Android, iPhone, and Windows Phone how tos.

First off, there is absolutely no way to get an increase of more than 25% from undervolting. The fact that undervolting will give you anything other than a placebo affect is one of the largest myths in android. I’ll break it down as simply as I can here.When the processor is in use (i.e. not asleep or idle) UV does save a tiny amount of power. I tested with the most extreme UV my phone could handle. With a high performance governor, e.g. smartassv2, extreme UV would reduce CPU drain by 13%, or about 7 mA. With a governor that keeps the CPU frequency low, CPU drain would be reduced by about 18%, or 4.6 mA (weighted – see the spreadsheet starting cell H88). Now remember, these savings are limited to the processor, and only when it is active. For most users, this will mean the screen is on. For comparison, the screen on minimum brightness displaying black uses 9mA. On max brightness, displaying white, it uses 690mA. Let us assume some median value, ~350 mA.

So, regardless of your choice of governor, even with extreme undervolting, you are not going to be able to increase your battery life by more than 2%. The argument about heat reduction is also laughable too. While I’m really not 100% on the specifics I can tell you that the actual heat reduction would be so minuscule you would never notice. Alas, there will always be people who will argue these points it really just can’t be helped. The graph shown is almost certainly fake. The developers of these multi million dollar projects to create software for our wonderful phones set these base voltages to the optimal level. Now it is, of course, true that each chipset is different and the maximum efficiency may lean 1 or 2 percent when concerned to voltage, but to answer the player who asked why they don’t UV out of the box (aside from the fact that there is no tangible benefit). They set it to the values they do because UV or OV (overvolting) can cause serious stability issues. Hope this clears thing up a little!