MACBOOK battery indicator error

May 5, 2011
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My white macbook OSX 2011 is quite new when i first started using it the battery would say 100% almost 10 hours etc now its 88% and showing 1.5 hours left!!!! i have looked at the battery health and it did say good before and now says normal ? so a couple of changes have occured can anyone help me ? It has had 166 cycles so far i also downloaded coconut battery and it says current charge 3460mah and max 5137 mah
many thanks

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