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! :
External Laptop Battery Charger for Apple iBook G3/G4 14-inch Series A – direct-charging
Apple Batteries: Apple M8403 - 10.8V 6-Cell Lithium-Ion Replacement White Battery for Apple iBook G3/G4 12" - CPU Medics
Apple iBook G4 13.3in i5 2.3GHz 4GB 320GB, For Parts Or Repair No Battery | eBay
Amazon.com: SLE-TECH Replacement Battery for Apple MacBook Pro 17-inch. A1189, A1151, A1212, A1229, A1261,fit with P/N: MA458, MA458*/A, MA458G/A, MA458J/A,MacBook Pro 17" MA092KH/A MacBook Pro 17" MA092LL/A1 2 : Electronics
Apple iBook Battery - G3 & G4 - 661-1764 661-2886
Apple iBook 12 inch battery G3 12 inch G4 12 Inch White Laptop Battery A1008 A1061 M8403 M8433 M8861 M8956