I can see the appeal of reusing old batteries and using heavier duty batteries like deep cycle batteries, but I've also seen people use jump packs they got from SCA and Jaycar for years and not have problems. I think the trick is to keep it constantly charged even when not in use and they'll last a very long time. If I had the skill set (and patients), id make a battery box and all that jazz but alas I am too lazy.
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