>>48750620no, no, this is a genuine thing to be concerned about. the cartridges for gen 1 and 2 NEED the batteries on cart to hold saves- if the battery runs out, the save is fucking gone. look at replacing the batteries with fresh ones before starting anything, and invest in some method of backing up the saves to something not bat-backed once you're done.
this doesn't apply to any other gen, fwiw, since the only other ones to use batteries, RSE, only use them for a clock (but you'll still want to replace the batteries before starting so that the clock will work right, for ingame events)