When we bought our rig used in oct 15 the dealer installed 2- 12 volt battlers. We already had 2 -6 volts. I wired them all together and they are still going strong today. I just check the water level once a month or so and add distilled water when needed.
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2018 Chevy 3500 LTZ Dually Diesel 4x4 CCLB
2011 Montana 3455 SA. 6 point level up. Disc brakes. Curt Q24 Hitch. 5 step glow steps
Progressive EMS. Valterra tank valves. Sailun G637 tires. ARP fridge control. All led lighting. Mor Ryde IS
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