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I have recalibrated both batteries many times, and both of them lately. For the one that has barely any charge, the cycle count is 567. For the one that turns off at a certain power level, it is 583.

I have two batteries for my iBook, and I routinely alternate them. Recently, both of them are acting oddly and giving me problems. One of them lasts only a few minutes, and goes immediately from 0% to 100%. The other charges all the way, and loses and gains power at a normal rate, but when it...