Apple PowerBook (500 Series) - Manual (Page 65)

Caring for batteries
m Always handle batteries carefully.
m Do not short-circuit the battery terminals (that is, do not touch both
terminals with a metal object). Doing so may cause an explosion or a fire.
m Do not drop, puncture, disassemble, mutilate, or incinerate the battery.
m Recharge batteries only as described in this manual and only in ventilated
areas.
m Do not leave batteries in hot locations (such as the trunk of a car).
m Do not leave a battery in your computer for longer than a week without
plugging in the power adapter.
m Do not leave a battery in storage for longer than 6 months without
recharging it.
m Take dead batteries to an Apple-authorized service provider for recycling or
proper disposal. The batteries contain hazardous chemicals and should not
be thrown out with household or office trash.
59 Health, Safety, and Maintenance Tips