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.
Is it okay to run my PowerBook or iBook without a battery? [9 & X]
PowerBooks have an internal rechargeable backup battery that saves your PRAM settings (printer, AppleTalk, clock, etc.). If you leave a PowerBook unplugged for a week or two without a regular battery installed, that internal battery will be depleted, your settings will be lost, and you may have trouble booting the computer. The regular battery also acts as like a ballast, maintaining smooth voltages to run your PowerBook. iBooks lack the internal backup battery and should always have a regular battery in place.
Should I get AppleCare for my portable?
PowerBooks and iBooks are manufactured more precisely, get rougher handling than desktop computers, and are expensive to fix. We think that Apple's own extended warranty program, ...