3 types of batteries : The AGM battery series are designed with advanced technology, super heavy duty grid, high performance plates and electrolyte. The AGM battery series have long and reliable standby life and high consistency for better performance in series use. The GEL batteries can avoid corrosion and stratification. The special separator can properly prevent short-circuit. It can offer high deep discharge ability, super thermal stability, good recovery ability after deep discharging. The deep discharge cycles of GEL batteries can be more than 50% compared with other normal AGM batteries.The OPZv batteries are designed for long lifetime and have excellent deep cycle performance. The constant power discharge capability and the low current discharge of the OPZv batteries are superior to normal batteries.