I’ve got the Noco trickle charger ironhorse posted. I use it on my snow plow truck that sits outside and has a weird electrical gremlin that drains the battery for some unknown reason. It works fantastic and I’ve had no issues in two winters of use. The only thing worth mentioning is I’m not sure if they are rated for lower than -20 or -25, so you’ll want to confirm that before purchase.
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