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1. Macintosh Troubleshooting Pocket Guide > 1.16. Powerbooks and iBooks

Powerbooks and iBooks

Does a battery drain when not in use? Are new batteries fully charged? [9 & X]

All batteries have some “self-discharge,” usually 1% to 3% per day. That means that the battery will be dead after a month or two of sitting on the shelf and will need a full charge. Brand new batteries are always shipped without much charge, and must be charged before use. The PowerBook 500 series uses “intelligent” batteries that can get dumb if left uncharged for more than a month. This means that even if you don’t use your PowerBook at all, you should plug it in for at least 24 hours every week so the batteries can charge. It’s okay to leave your PowerBook plugged in all the time.


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