Samlex America (SEC1250UL 50 Amp Battery Charger Switch mode technology for high efficiency, lightweight and quiet operation Can charge 2 banks of batteries simultaneously, no isolator necessary Can be used as a power supply or DC UPS when used in conjunction with a battery User Selectable (by DIP Switch) Selectable for 2 or 3 stage, rapid and safe charging of stand-alone and loaded Lead Acid Batteries Protections: Short circuit, overload, reverse battery polarity