Weird battery on Jailbroken ipod touch 4g 4.2.1 greenpoison RC6.1?

So, whenever the battery is on standby it doesnt go down... infact it goes up until it reached 95/96... So i never know if it actually has got battery or not. It only shows drainage (by 1%) whenever i enter an app and then quit again. So is their anything i can do? Like let it sit overnight til it's drained then charge it again?
 
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