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btw, when you wire two batts in parallel, be sure both jumper wires are the same gauge and length, and then connect your load and charging to ONE batteries positive terminal, and the OTHER batteries negative terminal.
this is probably not obvious to most folks, but even those short jumper wires between the two batteries have some small amount of resistance under higher currents, both charging and discharging, and this causes a voltage drop. if you wired both + and - to one battery, the other battery would see less of the total current, and not charge as fully. by wiring the way I described above, then the total system resistance is the same for both batteries.
like this... (picture cribbed from random site)
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Linear Mode
