Mtroniks VIPER MARINE 20 SPEED CONTROL - 24HV High Voltage260 51 The Viper Marine20 HV is a new brushed speed controller designed specifically for use in RC boats with a battery voltage of between 12. 0V and 24. 0V. The installation, set up and operation of the new HV Viper range has been designed to be exactly the same as the original Viper range which we have been 'warned' never to change!! An exciting feature of the new 24V HV Viper range is addition of Lipo battery pack compatibility as well as the usual