The Zerostart 3400103 25 Watt 120 Volt Battery Heater is 3″ x 5″ with 2-Prong non-grounded plug.
Maintain available cold cranking amps in cold weather by warming the batteries. Improved recharge time.
Silicone pad heater placed underneath the batteries. Silicone material is resistant to battery acid. Slim design to fit in the battery box/tray.