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To finish the job, I ordered this little kit which adapts a "coin battery" to fit onto the pads originally occupied by the nasty Varta:
https://www.ebay.com/itm/355497835640

The PCB uses a MOSFET to prevent current from flowing into the non-rechargeable lithium battery when the system is powered.

Older designs used a diode, but the ~0.6V drop across it would bring VCC too close to the lower limit for the Ricoh.

#amiga #retrocomputing #vintagecomputing #electronics