The HDZ COMBO features a sealed valve regulated lead acid battery that provides a minimum emergency duration of 90 minutes. Standard features include low voltage disconnect, AC lockout and brownout protection.
BATTERY: The HDZ COMBO series is designed with a maintenance free, sealed valve regulated lead acid battery that provides a minimum emergency duration of 90 minutes (for the listed rating). Recharge time of the battery is forty-eight  hours The operating temperature is from 50°F up to 104°F (10°C up to 40°C).
CIRCUIT: The HDZ COMBO series utilizes a high-efficiency two stage charger providing a fully automatic constant charging current with low voltage disconnect protection. All components used in the circuitry are temperature compensated. The charger also has brownout and short circuit protection. Charger status is easily determined via a dual diagnostic, internal LED display which indicates AC/ON and High Charge. An internal dust tight push button test switch allows mainte- nance personnel to quickly determine the operational status of the unit and lamp load.