As everyone knows, we all want the ability to go all day on a single charge on our phones, but for some of us it’s not possible with the usage we put our phones through. So developers started to build kernels to under-volt the processors while still keeping the the stock speed of the phone.
As with anything, we always want to test the limits, and that’s what the developers did. They were able to go down to 850mV from 1000mV while still being stable. In theory, supplying less power to something would leave an excess stored, but it did not seem to be the case for a good majority who tried the kernels.
So persiansown, decided to do a blind-test study on the different under-volted  kernels. He chose three of the 1000mV(stock), 950mV, and 850mV, and did the study for two weeks with people who signed up to take the study and came to the conclusion that suppling a LOT less power to the phone makes the antenna work harder and so decreases the battery life, but if only a small decrease in power is made, it increases the battery life.
If you want, you can go read more on the blind-test study, or if you want to try it for yourself, you can go and download the latest kernel from persiansown.
Source: XDA
