12 Pack CR2025 Battery, CR2025 3V Button Cell Lithium Game Batteries with Solder Tabs for NES, SNES, Gameboy and Sega Genesis Cartridge Battery Replacement

Unfortunately, I'd have to stick at $135 (I was actually going to be including the replacement battery for free, I just don't have the tool to install it). That said, some friendly advice: $15 is astronomically high to replace a battery. You can buy 12 batteries for $13 on amazon. Do you feel like the 30 second battery change is worth $13 of time? As an fyi, most game stores charge between $5-10 AND include the battery in the change. My local stores are around the $5-7 range, including battery.