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A possible fix for a Mac that won't power up
Authored by: johnsawyercjs on Apr 14, '05 06:51:45AM

Actually, you want to measure the battery's voltage and its current--lithium batteries (at least the 3.6 volt, 1/2 AA batteries used to power Mac clock/RAM chips) will maintain their rated voltage even after they've practically drained away, but their current level will tell the true story; they won't measure substantially less than their rated voltage until some time after they're no longer useful. What's happened is the battery's chemicals have changed state, to the point where the battery is basically a big resistor and so they can't deliver enough current, though the voltage deceptively still looks OK. Unfortunately, many cheap digital meters don't have a current measuring scale.

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