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Best possible solution would be to purchase an extra smaller AGM battery to run the cooler from. Then get a 12 volt relay that is powered on by the ignition to allow recharging of the extra battery. That way the main AGM battery is always at full charge, and the operation would be completely automatic and safe. The extra battery might be low enough profile so it will fit in the rear hatch storage area, which would make it a very neat and tidy installation.
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