Battery power jumps off cliff

Hi guys--I have a question about a wierd thing that has happened to my ibook 900 MHz. The battery power jumps off a cliff when the charge drops to about 90% and the computer goes to sleep, no warning or anything. I rarely use the battery so I only noticed this recently. Last time I used the battery--about 6 months ago, it was fine. Any ideas? I would doubt it is "worn out" because like I said it is hardly ever used.
Thanks much.

You can try resetting the PMU. The PMU (Power Management Unit) has control over the charging function, so resetting it may help, but it is most likely that the battery needs to be replaced. You may doubt it, but according to the Washington Post, "A typical lifespan is two to three years, whether it is ever used or not…"
So, not using the battery isn't going to extend its lifespan very much, if at all.

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