Just got a new Gameboy color, can someone tell me how to save

The Game Boy Color Accessory You've Been Waiting For

Game Boy Horror IPS BACKLIT Nintendo Gameboy Color and Free Game With New Housing, Speaker, Buttons, Screen Lens. Cool

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So my save data…wasn't deleted? See my previous post for context : r/Gameboy

Requires 2 AA Batteries

Game Boy Color - Kiwi

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