My 2001 PowerBook G4 (Gigabit Ethernet) is still going strong (the battery however is dead :-( ) : r/VintageApple
Guess who managed to score an original PowerBook G4 titanium battery in mint working condition with only 41 cycles on for just £10. An accidental miracle. Facebook market place to the rescue! :
14.4v,4400mah,Li-ion,Replacement Laptop Battery For Apple Powerbook G4 15", Powerbook G4 15" Titanium Series,(fits Selected Mo - Buy Replacement Laptop Battery For Apple Powerbook G4,Powerbook G4 15" Titanium Series,Compatible Part Numbers 616-0132 ...
OEM Apple PRAM CMOS BIOS Battery 820-1343-A for PowerBook G4 15" Titanium A1025 | eBay
Apple PowerBook A1045 A1078 G4 15" Aluminum Series Battery (M9325G/A) | eBay
My Titanium PowerBook G4 Repairs (Continued ...) | MacRumors Forums
NewerTech® : Batteries : PRAM Battery for PowerBook® G4 17-inch Aluminum 1.5GHz – 1.67GHz Systems
$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