Milwaukee 48-11-1833 V18 Multi-Pack 18-Volt and 28-Volt Lithium-Ion Charger with 2 18-Volt Lithium-Ion Batteries Combo Pack Lithium-ion technology offers up to 50% longer run-time than 18-volt NiCd batteries Compatible with all Milwaukee 18 to 28-volt batteries; 14.4-volt NiCd battery weight with 18-volt power Backwards compatible with older NiCd tools Dual-chemistry charger charges both lithium-ion and NiCd batteries from 18 to 28 volts 5-year/2000-charge warranty