The BatteryMINDer 244CEC1-AA-S5 - 24 Volt 4 Amp is designed for use with 24V Concorde aviation batteries. The unit is part of VDC Electronics' CEC1 series (certified to California Environment Commission Standard) of aviation-calibrated battery charger/maintainers/conditioners. The CEC1 series feature advancements in easy to understand battery analysis and condition not previously available in any other single model and have been approved and recommended by Gill, Odyssey and the Concorde Battery Corporation exclusively for their sealed valve-regulated AGM (Absorbed Glass Mat) aviation batteries.