Ibook Battery Indicator Not Accurate

I was wondering if anyone out there had the same problem as me. When I use my 12" iBook on the portable battery, the computer goes to sleep earlier than indicated. When I have 22% of battery left, it suddenly says 0% and goes to sleep. Moreover, when I recharge it, it charges up to about 88% and the power adapter turns green. It then suddenly says 100%. I recently recalibrated my battery so I don't think thats the problem. Does anyone know what is wrong and what to do? Thanks

Hi Pal,
Heres some info on the iBook's battery. Also you might want to look at Battery FAQ
Just some info,
Jon

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