Zerostart 3400066 (Wolverine Model BH60CSA) Silicone Pad Battery Heater | 120 Volts | 60 Watts Maintain available cold Cranking amps in cold Weather By warming the battery Slim Design to Fit in the battery box/tray Silicone material is resistant to battery acid Not for lithium Ion batteries or use in an insulated battery box 5" (14 cm) x 8" (21. 6 cm) Volts: 120 | watts: 60 | amps: 0. 5 | plug type: 120 Volt, 15 Amp No ground (type E) Heater use Not recommended at temperatures above 50f (10c)