I have the PowerMac G3 B/W. I have learned that, in order for it to work, the battery has to be installed.
The PowerMac G4 motherboard does not have to have the battery.
What I am wondering is, can the PMG4 MB fit into the PMG3BW case? They appear to be the same size and all; however, I have no idea of the screw positioning.
Battery: $7 each. Annual replacement.
If I want to get G4 processor in G3 slot, it's $200+
G4 MB: $25 eBay. Processor: ~$30-40. Front light/button board: $5.
$200+7 annually to $25+30+5=$60, maybe the $7 every 1.5 years