Lester Summit II Series Battery Chargers offer High Efficiency, High Reliability, and Multi-Voltage Support.Auto Ranging Voltage. Multi-voltage support works with 36V and 48V battery packs.Automatic DC output voltage detection and adjustment.Switch mode technology for high efficiency.Universal AC input with IEC inlet.Allows for on-and-off board charging.IP66, NEMA 4 rated sealed enclosure.Winter Storage Mode.Intelligent natural convection cooling (no fan).Battery temperature sensor and remote LEDs.Bluetooth Smart wireless communication lets users view charge cycle status, select active charge profile, upload new charger profiles and download charge cycle history records. (Apple iOS or Android phone/tablet with apps required).13-18 Amperage. 36-48 Voltage. 650 Watt.