Streamlight - Battery Chargers; Battery Size Compatibility: 3.7V; Battery Chemistry Compatibility: Lithium-Ion; Charging Time (Hours): 3.50; Charging Time (Minutes): 210; Maximum Number of Batteries: 2; Voltage: 3.70; Includes: 120V AC Adapter; USB
3.7 Volt Battery Charger easy Circuit Diagram
Amazon.com: Blomiky 2 Pack 3.7V 500mAh Li-ion Rechargeable Battery SM 2P Plug with USB Charger Cable for Double Sided RC Stunt Car Small RC Boat Tumbling Amphibious RC Car RC Truck and
Amazon.com: Threeking 3.7V 500mAh 14500 Rechargeable Li-ion Battery SM-2P Joint with USB Charger for Rc Remote Control Car Toys : Toys & Games
Single Slot Li-Ion Battery Charger for 18650 3.7V Rechargeable Battery