Chosen Solution

It seems that We Love Macs once sold a replacement clock pram battery for the Powerbook 500 series, however it is no longer in stock. What would be the best strategy for replacing/fabricating a new one? Is there another one that would work just as well?

Apple part # 922-0786. Well that’s hard to find but here it is: https://www.applemacparts.co.uk/powerboo