The Apple rechargeable batteries for 12 G4 PowerBook are a 50-watt-hour lithium-ion battery that provides up to 5 hours of operation depending on how you configure your system and the battery saving features you use. For best performance, it is really important to calibrate your PowerBook G4 battery to maximize the battery life and lifespan of your PowerBook batteries.
After a period of time, you may find that your PowerBook G4 battery will power your notebook for only a couple of hours, which requires you to charge more often. Batteries for 12 G4 PowerBook have a limited number of charge cycles and may eventually need to be replaced. It is strongly advised to buy PowerBook replacement batteries while your battery still has a little power left. Don’t wait until the battery does not hold enough energy to power your notebook otherwise you may be stuck plugged in.
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