Welcome, bentley.
NewerTech makes batteries for all of the G3 and G4 PowerBooks (and iBooks) including the titanium model. NewerTech's batteries even have higher power ratings meaning they should hold their charge longer:
http://www.newertech.com/titaniumbattery
Quote:
This battery is compatible with the following Apple PowerBook G4 Systems:
- PowerBook G4 - 400MHz - 500MHz
- PowerBook G4 "Gigabit Ethernet" 550MHz / 667Mhz
- PowerBook G4 "DVI" 667MHz / 800MHz
- PowerBook G4 "(1GHz/867MHz)" 867MHz / 1GHz
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http://eshop.macsales.com/item/Newer...gy/BAPT4800LI/