This electric battery heater pad from Wolverine heaters provides an easy to fit yet effective solution for restoring vehicle battery performance in cold conditions. A very cold battery may not be able to supply enough current to start an engine so by fitting a Wolverine heater pad you can improve the reliability and performance of your battery.Improves battery performance and efficiency in cold conditionsEast to fit, simply place underneath the battery60w heat output to effectively warm up the battery without damageThe Wolverine battery heater pads require a 230v power source which means a 13amp plug is required (not included). For wiring purposes the centre wire (green / yellow) is wired to earth pin and the other two wires are to live and neutral (it doesn't matter which way round they are wired). If you are unsure of how to wire, please call for further help.*