guys. i'm having the problem with my rooted gs2 (siyah kernel v3.3.2 with litening' rom v3.6)

everything seems okay. except for the weird behavior of the battery. when i unplugged the charger, it shows i'm still charging. and the battery icon keeps blinking plus it don't shows the real percentage of the battery.

when i'm charging the phone the battery easily reach 100% in short time. then when i unplugged same thing happen.

been full wipe and flashing again. still happen. is it the rom or the hardware? (usb port or battery)