HELP! Battery indicator automatically increasing without charging..

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http://forum.xda-developers.com – My lil' bro's GT2-P3110's battery indicator/notification became weird, it was started last night. The battery indicator/notification was increasing automatically without charging it. I've tried rebooting the device but it keeps on increasing. After rebooting, the battery indicator was 40% but after a few seconds it will increase until it reached 100%. It was frustrating because it didn't know what is the real battery status of the device. =( I hope anyone can I help me out. Thanks in advance! (HowTos)