I replaced my 12 volt dealer battery with two Trojan 6 volt lead acid golf cart batterys. If you are not using solar then two 6 volts are plenty and you get more amps out of the 6 volts than 12 volts. If dry camping then i can charge them up fairly quickly with my Honda portable generator. If going solar then i would go 4 or 6 batterys. In storage I keep my batterys on an deltran 1.5 volt battery maintainer and add distilled water 2 or 3 times a year. I use an pigtail on the batterys to hook up the charger and i don't have to remove the lid to charge the batterys. As for the battery box, i used some plywood to make me a box to fit both batterys and made a lid for the box with the lid cut out in the middle and screwed the old vent to the lid then i made some notches in the box and lid for the cables to go between. The lid sits down on the box evenly all the way around with no problem.
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