NewerTech® : Batteries : PRAM Battery for PowerBook® G4 17-inch Aluminum 1.5GHz – 1.67GHz Systems
Apple PowerBook Titanium G4 15" PRAM Battery Fix - YouTube
PowerBook G4 does not start. PRAM Battery? | MacRumors Forums
Making a damaged PowerBook G4 work on battery | Overclock.net
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BU-911: How to Repair a Laptop Battery - Battery University
$25 dollar ebay 2001 PowerBook G4 Titanium. Advertised as not powering on, reset the pram battery and it's good as new. No chipping and hinge damage. Near mint condition. : r/VintageApple