Backup battery replacement battery for cartridges used by Gameboy Advance etc. [ Both Standard / Type B engraved side will be [+] ] 3V button lithium battery (not chargable) tab for easy replacement. [Note] Please only purchase this product if you have been aware of the following: *This product is designed for those who have experienced battery replacement. Battery replacement is at your own risk. *Separate from batteries, you will need tools such as a special screwdriver ( Gameboy / DTC-20 ] [ Gameboy / DTC-20 ] [ Gameboy Advance / Y-Shaped Screwdriver) to open solder/cassette. Set Contents: Set of 10. Product details: Coin battery (CR1616); Voltage: 3V; Dimensions: Φ0.6 inches (16.0 mm); Terminal Width: 0.08 inches (2 mm); Terminal Length: 0.2 inches (5 mm); Terminal Spacing: 1.1 inches (27 mm); Both Standard / Type B faces engraved are [+] Specially welded metal terminals to CR1616 used in Gameboy Advanced Soft. Can be soldered directly to the substrate. Soldering wires directly to CR1616 without metal terminals is very dangerous. Trademark "Atelier garage" Registration No. 5976430