Question.why Cant I Get 6 Hours Off 1 Battery?>>

[WAH]

all i wanna do is have my phone work for a little bit.
i flashed the mighty,which worked the best,and THIS PHONE SUCKS BALLS.
had to jump out of the truck,on the highway,just so id be able to make an important phonecall.my backup battery was in my bag in the side of the truck.
well,i put the other battery in,which was fully charged,and after about 30 minutes,there was one life bar left.
W
T
F?