You are correct.
One can solder in a temporary “helper battery” (or 3V power supply) to the same traces but in a different spot, to keep the SRAM alive while the real battery is replaced.
Some later games (GBA-era) use Flash memory and the battery is just for the clock.
This; works on Mull; there is no submit button, it just constantly refreshes the results and thus is slow AF from continuously juggling the data.