48V Tenergy Smart Universal Charger for 40-cell Nimh Battery Pack (1A) Universal Fast and Smart Charger is designed for charging any 48V NiMH and NiCd Battery Packs. (40 Cells pack) The charger can cut-off power Automatically by negative delta V IC when battery pack is fully charged. Protection fuse for over current, short circuit & reverse polarity protection. One standard Tamiya male connector installed with the charger. LED Display - Red Light: Charging - Green Light: Charging complete and Trickle Charging