Batteries are fussy. They can have all the capacity you want but unless charged properly they wont perform as expected.
Buy two batteries. Lave one behind to charge during the day. Not because you think one wont last. Since your getting two. Size them for transport.
Get a proper 3 stage charger. I sell a real nice one rated at 5 amps another at ten amps for 55 and 65 bucks respectably. They are meant for solar systems.
Always deep cycle batteries as that is their purpose. To be run down.
Cheers
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