This afternoon I installed Mint 14 Mate 64bit. I've noticed that my battery life has gone down from 5hrs to 4. I am using the standard drivers. If it helps here are the specs of my laptop:
AMD Phenom II X2 N660 3.0 Ghz
ATI Mobility Radeon HD 4250
9 cell battery
P.S Sorry If I posted in the wrong spot. I looked at the categories and still wasn't sure which this issue would fit under.