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From Sonic Retro

CR2032 battery

CR2032 is a designation for a small 3-volt battery about the size of a nickel, very commonly used as the battery for supplying power to SRAM chips to prevent them from losing the stored information when the console is turned off.

It's a very popular battery and in case you ever need to replace an ailing CR2032 they're sold at most electronics stores.

Uses of the CR2032

• Dreamcast Visual Memory Unit
• Sonic the Hedgehog 3 cartridge
• Sega Saturn Internal Backup RAM
• Neo Geo Pocket