The backup battery, which powers the date and time while your computer is shut down, and lets you boot up without the AC adapter, is quite easy to replace on a Powerbook 5xx. All that´s needed is a small TORX driver (available at any hardware store for less than $5.00), a grounding wrist strap and some common sense. JB Cole shows you how on his web page:
http://members.home.net/jbcole/pb500help.html

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