I put a tool box on the tongue of my trailer. On the car trailer I put one 31T semi truck battery in one end of the tool box. It is 959 CCA with 3/8-18 threaded top terminals. This makes it very easy to hook the winch wires and charge wires to. It runs the winch great. I charge it through the trailer plug accessory power supply. I just put a 20 amp circuit breaker in the charge wire. That way if the winch battery is low and tries to pull too many amps through the truck's harness it trips the breaker. I have wired the charge circuit this way for years and never had an issue.
My car trailer may set for months and never be used. The battery usually is fine whenever I use it. I do put the battery charger on it in the late fall so it has a full charge for winter. Never had a battery fail yet doing it that way.
The best thing about using the 31T batteries is they can be bought cheap. Nice big battery for $75-80. That is because they are used by the thousands in semi trucks. All the ones I have come with a handle made into the top which makes handling them really easy for us older fellows.
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