Anyone know a Summerboard batteries MaH, voltage and amps?

I’m about to buy a second hand Summerboard, but it only has one battery coming with it. Does anyone know of the MaH, voltage and (if necessary to know) the amps that the stock batteries are? I’m not wanting to drop $300US on another battery, and want to look into other options I could adapt. Would be happy to hear anyone’s input.



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