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Rechargable batteries DO eventually die... however the weather you leave it docked at 100% wont make a difference. Its the amount of use the battery gets.
 
That can still happen. Rechargable batteries eventually die.

yeh on one of my workhorse powerbooks the batt just suddenly dropped off max capacity one day to 88% and then two weeks later to 77%. So, time to get another one, it only has about 200 cycles on it but it's more than 2 years old.
 
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