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Same problem here -- Call AppleCare!
Authored by: dcheng on Mar 13, '03 05:34:21PM

A few months back, I had the exact same problem with my iBook G3/600 (16 VRAM) battery. It would drain normally from 100% down to about 50%, at which point the charge would abruptly drop to zero and the machine would go to sleep.

A quick call to Apple tech support had me resetting the PRAM, NVRAM, power manager, and other "standard" things, but to no avail.

It was quickly determined that my four-month old battery was defective, and I was couriered a replacement the following day under the AppleCare warranty.

I believe "decent" battery performance is covered under the AppleCare extended warranty plan. I recharge my battery at least once a day, so I can easily reach the "average" life-expectancy of 500-600 cycles for Li-Ion cells before a year is up. Considering the cost of a new iBook battery, the AppleCare warranty will pay for itself in new batteries alone!

FWIW, my replacement iBook battery that's about four months and maybe 200 charge-cycles old shows:

voltage=12540 flags=5/0x005 amperage=1200 capacity=3645 current=3645 [100.0%]

with noticably worse -- but still acceptable -- performance from when it was new. It equates to around four hours of continous, low-processor use with the screen brightness at 10%.

-Dave

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