RapidMax Twin Dual Port Battery Charger 140276002 Dual rapid charger  charges two batteries simultaneously in just 30 minutes. Fan cooling  blows cool air through the battery to increase the speed of charging on hot batteries. Charges all RIDGID NiCd batteries  charges all battery voltages from 9.6V to 18V. LED diagnostics  indicates cold, hot, deeply discharged and damaged packs.