4 Pcs Silicone Rubber Heating Pad, Silicone Heating Blanket Flexible Silicone Heater Mat Rubber Heating Blanket for Industrial Equipment 20W 12V

They do exactly what they say they are going to do. I'm using them to heat up my battery box. I'm now trying to figure out how to attach them because they get really hot really fast. I am debating using high-temp silicone to more or less glue them to the bottom of my box making a chamber below the batteries with uni-strut.

These are essential if you have lithium batteries and the temp outside drops below freezing ! Also good to tape to your tanks to keep them from freezing .

This 20W 12V silicone rubber heating pad delivers fast, consistent warmth—perfect for battery warming, 3D printers, or DIY projects. Its flexible, durable design adheres well to smooth surfaces and resists moisture and wear. Just pair it with a thermostat for safe temperature control. Great value for efficient, low-voltage heating.

These pads are Hot Stuff!!!!

Gets hot! But not too hot. Seems well made and efficient at making heat. I'll be mounting these to a metal plate to help spread the heat out a bit and use them along with a programable temperature controller to aid in warming lithium batteries for safe charging in winter conditions.

This gets very hot. I tried two in series and then it was not hot enough. I had to add them to an aluminum heat sink with small 12v fans to heat my lifepo4 batteries. This works perfectly. I added a thermostat to control it. Will melt foam insulation board if placed on it directly.

I appreciate the quality, quantity and pricing

So far so good. Using these to keep my RV lithium batteries above 32 degrees while camping as lithium batteries will not charge below that temperature.