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The battery you have is probably 12 v, and adding a second 12 v battery will of course double your capacity.
An even better approach is to use golf cart batteries, you can get 2 6V deep cycle 6 volt batteries that will fit in same space. You must wire them in series. They are taller and heavier but fit in existing battery holder. They will provide more capacity due to extra lead/size and Ah capacity. Trojan T105 are good example. I use these for both RV and electric boat, golf cart stores will carry them and help you connect correctly.
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 best regards,
Tom
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