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pendlewitch

 
Member Since: Sep 10, 2011
Location: Nelson,UK
Posts: 1,728
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Mac Specs: iMac 27" Mid 2010, 3.2GHz Intel Core i3,4GB 1333 MHz DDR3, ATI Radeon HD5670 512MB, Mavericks 10.9.1

pendlewitch is offline
Hi,

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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