Game boy advance game cartridge batteries

Hello, My son says that several of his GBA game cartridges are no longer saving his games. I know from past experience with an older son that the games can be opened and new batteries can be soldered in non working game cartridges. I want to buy what my son needs to repair his games as a Christmas gift. I have ordered the triwing screwdriver but I don't know what batteries to get. Are there different sizes used in different GBA games or is there a standard size? If there are different sizes, what are they? Where would you recommend buying them? MOM
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