RV Lithium battery box heater
I am using three of these on a heating unit I designed for tongue mounted battery boxes (Harbor Freight Tongue box). I converted my RV to Lithium batteries and the batteries will be damaged if charged below 35 degrees F. I put these on a 12 volt thermostat that I can switch on when cold weather is expected. They come on at 40 degrees and keep the battery box warm. Great product. Read more













