The Anton Bauer HyTRON 140 is a Nickel Metal Hydride (NiMH) battery. NIMH provides the highest energy density cells available. An on-board "Fuel Computer" is built-in to the HyTRON 140 to keep a constant vigil on the battery energy I/O, as well as critical operating characteristics and conditions. Anton Bauers InterActive technology ensures safe and optimized performance by allowing the charger and battery to communicate all critical battery condition parameters with each other.