Battery loses power even when iBook closed

Hi,
As of late, even when I close my iBook and carry it around in my bag, the battery is running down. I have taken to shutting it off before I carry it, but this is not always convenient. Any ideas about what could be causing the problem/if there's a way to fix it? It does seem to latch shut (and go into sleep mode) when I close it.
Thanks!

Welcome to Apple Discussions!
You could try resetting the PMU and see if this helps:
Resetting the PowerBook and iBook Power Management Unit (PMU):
http://docs.info.apple.com/article.html?artnum=14449
Also, you might want to check the health of your battery. (About this Mac>More Info>Power). If your battery has a lot of cycles on it, it could just be getting old and not holding a charge as well as it once did.
Good luck!

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Battery loses power even when iBook closed

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