(1) CR2025 Replacement Battery with tabs

The tabs are pre-soldered and sit flush, so I didn't have to wrestle with tiny wires to get them into the cartridge slot. My Pokémon Crystal save held through a full week of play before I even remembered it needed replacing.

My old save files had been dead for years until I grabbed this, and the pre-attached tabs made the swap a two-minute job instead of a fiddly mess. Popped one into my Silver cartridge last night and my team from 2001 is finally back.