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10.4: View battery cycle count in System Profiler
Authored by: Felix on Jun 24, '05 03:35:22PM

>>Does this show how many cycles are remaining or how many the battery has gone through already?

Cycles the battery has gone through to date. BTW, it's not merely the number of times you've plugged in the recharger; rather, the equivalent number of full discharge/recharge cycles.

Couple of Apple web pages on the subject:

http://www.apple.com/batteries/

http://www.apple.com/batteries/notebooks.html

"Battery Lifespan
A properly maintained PowerBook or iBook battery is designed to retain up to 80% of its original capacity after 300 full charge and discharge cycles. You may choose to replace your battery when it no longer holds sufficient charge to meet your needs."

"A charge cycle means using all of the battery's power, but that doesn't necessarily mean a single charge. For instance, you could listen to your iPod for a few hours one day, using half its power, and then recharge it fully. If you did the same thing the next day, it would count as one charge cycle, not two, so you may take several days to complete a cycle. Each time you complete a charge cycle, it diminishes battery capacity slightly, but you can put both notebook and iPod batteries through many charge cycles before they will only hold 80% of original battery capacity. As with other rechargeable batteries, you may eventually need to replace your battery."



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