Why would cause my battery Level to read incorrectly?

My level shows 90% and above all day. I switched to time instead of percentage and it says 2:26, now the percentage says 87%.
Any ideas? The macwas made in 2008, Alum/MacBook 13".

Welcome to Apple Support Communities.
You likely need to calibrate the battery. It would not hurt to reset the SMC and also the PRAM.
Battery Calibration: http://support.apple.com/kb/ht1490
SMC reset: http://support.apple.com/kb/ht3964
PRAM reset: http://support.apple.com/kb/ht1379

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Why would cause my battery Level to read incorrectly?

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