I have a Pokémon Gold cart and Silver Cart that were dropping saves intermittently.
I opened the carts popped off the battery leads using a tiny flathead and replaced the 2025s with new ones from the store.
I taped them into place and used my multimeter to test the little solder patches with the battery in place.
It read 2.7V which is ok for a battery from the store.
I closed the cartridge back up, and popped it in.
I start a new game and save after I leave the house.
I soft reset (select,start,a,b) and check my save, Its still there.
I power off the Gameboy color, and power it back on.
The saves are gone, 100% of the time on both carts.
What do I need to do? I seems weird that there would be a hardware malfunction on both carts simultaneously.
It must be something Im doing wrong.