Sky RC Nitro Car, Buggy, Truck or Truggy Engine Heater with LiPo Cut-Off and Timer This innovative new engine pre-heater is one of the best trackside nitro accessories you're ever likely to purchase, which up until just recently has been an expensive luxury! This heater however is set to change that by offering equal performance of other heaters on the market, but at a fraction of the price! The engine heater can be used in conjunction with any 12v source including a car battery, starter box sealed lead acid battery, or even a 3S 11.1v LiPo for the ultimate in portability and performance! Unlike other engine heaters however this one offers LiPo voltage cut off, along with a duration related cut off timer which makes operation of the heater both safer and simpler than other products currently available. The engine heater is ideal for use during the break-in procedure of any nitro engine, but obviously it is also a great help on the cold winter race mornings where engines tend to get so cold and so tight that they often struggle to start. It's recommended that you always pre-heat your engine before any run however, just to allow the engine to be at peak consistent performance before hitting the track.