While Koppie's advice is solid. I always replace the battery holder with [link|https://retrogamerepairshop.com/products/hdr-game-boy-game-battery-retainer?variant=40511013290156&country=US¤cy=USD&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic&com_cvv=8fb3d522dc163aeadb66e08cd7450cbbdddc64c6cf2e8891f6d48747c6d56d2c|this one from Retrogamerepairshop.com.|new_window=true] It allows you to remove and replace the battery without soldering and resoldering. I use this in my shop and people love it.
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While Koppie's advice is solid. I always replace the battery holder with [link|https://retrogamerepairshop.com/products/hdr-game-boy-game-battery-retainer?variant=40511013290156&country=US¤cy=USD&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic&com_cvv=8fb3d522dc163aeadb66e08cd7450cbbdddc64c6cf2e8891f6d48747c6d56d2c|this one from Retrogamerepairshop.com.|new_window=true] It allows you to remove and replace the battery without soldering and resoldering which runs the risk of damaging the board. I use this in my shop and people love it.
While Koppie's advice is solid. I always replace the battery holder with [link|https://retrogamerepairshop.com/products/hdr-game-boy-game-battery-retainer?variant=40511013290156&country=US¤cy=USD&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic&com_cvv=8fb3d522dc163aeadb66e08cd7450cbbdddc64c6cf2e8891f6d48747c6d56d2c|this one from Retrogamerepairshop.com.|new_window=true] It allows you to remove and replace the battery without soldering and resoldering. I use this in my shop and people love it.
Happy iFixing!