This is a brand new generic CR2032 coin cell battery with tabs. If your Nintendo NES, Super Nintendo, Nintendo 64, Sega Genesis or Sega 32X game is failing to save properly the most likely cause is a faulty save game battery.

You will need to security tool to open your game cartridge which are sold separately.

• Nintendo NES Game Cartridges: 3.8mm security bit
• Super Nintendo Game Cartridges: 3.8mm security bit
• Nintendo 64 Game Cartridges: 3.8mm security bit
• Sega Genesis: 4.5mm security bit [Most common], 3.8mm security screw bit [Less likely], Infrequently spanner bit or T8 tamper resistant torx
• Sega 32X: 4.5mm security screw bit

Installation does requiring soldering skills and supplies, although step-by-step color instructions are available for download.