Member Since: Sep 10, 2011
Mac Specs: iMac 27" Mid 2010, 3.2GHz Intel Core i3,4GB 1333 MHz DDR3, ATI Radeon HD5670 512MB, Mavericks 10.9.1
11-18-2011, 03:10 AM
It would be very rare that the starting capacity of a new battery ever reached 100%; it would be more likely between 85% and 95% so we never start off on a level playing field anyway.
Lithium batteries need regular partial discharge and the smaller the depth of charge the longer the battery will last.
Leaving batteries at a full state of charge for extended periods can be extremely damaging which is what I suspect had happened originally with you. Elevated temperature levels can also adversely affect battery life.
If for example you let the battery run to say 50% and then recharged, you would get approximately 3 times more discharge cycles out of it than recharging it from dead. The figures get really interesting when charging from 90% capacity....almost 10 times more discharge cycles !
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