Default [Help]Xperia U Battery Percentage Problem

I Hope i Posted i the Correct forum (Please delete if inappropriate)

I've Encountered This problem when i returned to Stock ICS .100 for xperia u, i flashed 2 Jellybean roms and not encountered this Problem, its just that Whenever im Charging my phone, it doesnt increase in Percentage, For example, I charged it on 50%, but after an hour, i noticed that it is still on 50%, AFAIK it must increase atleast 5% or something like that.

Any Help would be Greatly Appreciated
ST25i "kumquat"