Cat 18-V Lithium-ion Battery Charger (Charger Included) in the Power Tool Batteries & Chargers department at Lowes.com
DEWALT 18 Volt to 20 Volt MAX Battery Adapter - Gillman Home Center
DeWALT DC9310 Heavy Duty Fast Cordless Vehicle Battery Charger, For Use With DeWALT 7.2 to 18 V NiCd/NiMH/Lithium-Ion Battery, Lithium-Ion Battery, 1 hr Charging, 1 Battery | Turner Supply