Features Can be switched between “Rapid Charge (one by one)” or “simultaneous charge” 2 x USB ports Can be powered by engine generators 2 stage overcharge protection system – stop current detection system and a built-in battery temperature sensor Charge indicator lamp to check status of each battery Charging Times BSL1415/BSL1815: 15 min BSL1420/BSL1820: 20 min BSL1425/BSL1825: 25 min BSL1430/BSL1830: 20 min BSL1440/BSL1840: 26 min BSL1450/BSL1850/BSL36A18 BSL1460/BSL1860: 38 min BSL36B18: 52 min