Quoted from PinWiz1969:Customer needs the game for a party this weekend so it’s not an option.
Just stick AA Lithium batteries in it to get you though the weekend and upgrade to NVRAM at a later time.
Quoted from PinWiz1969:AA batteries leak and coin cells don’t.
The term "AA" refers primarily to the batteries physical size regardless of its chemical makeup; from a leakage standpoint there is literally no difference between AA sized lithium batteries and a 2032 (20 x 3.2mm) sized coin cell lithium battery.