[Q] Plz help me. My stcok xperia arc alwaysstock at 100 % battery status topic

I'm using xperia arc stock rom ( ics), When i pull out battery, after powering on my battery icon always stock at 100%. It never decrease form there. Plz help me how can i fixed it? ? ? I thing stock kernel has some problem. when i change another kernel except to its stock then it will shows accurate battery status. :confused :crying: