The Alpha Clear Case Nickel Cadmium (Not for Sale in the USA or Canada) battery is designed to provide backup battery power to support various critical applications. This high performance battery has four different discharge models that allow the end-user to choose the correct battery bank for individual applications. The HDV NiCad Clear Case models are available for very high discharge rates. The impact-resistance clear case allows the user to easily observe electrolyte levels, as the batteries require minimal topping throughout their lifecycle. Each battery is delivered in charged condition filled with electrolyte.