Game Boy and Game Boy Color games use a CR2025 or CR1616 horizontal mount "Surface Mount" battery (CR2025 batteries will normally fit fine in games made for a CR1616 battery and will last longer)

Game Boy Advance games use a CR1616 horizontal mount "Surface Mount" battery and will need a "triwing" screwdriver to open them.

Most nonportable console games use a CR2032 horizontal mount "through hole" battery but it is worth having a look before you order anything.

I have moved from Patreon to Floatplane!
For just $1 you can follow me on Floatplane for a photo of every video game item I get, when I get it. https://www.floatplane.com/channel/ga...