DIY Li Battery Heater...A REAL TEST!

DIY Battery Heaters...A REAL TEST!...got down to 7F degrees last night. At 7am the battery compartment is at 35 degrees. Controller is set to turn on at 35F and off at 38F........The batteries are at 90% on the monitor.....Working GREAT!... http://rvbprecision.com/rv-projects/lithium-battery-heating-project.html

http://rvbprecision.com/rv-projects/lithium-battery-heating-project.html