USB Li-Ion charger 0.5A for battery tubes of S2X and S2RED headlamps
5V 2A Type-C USB 3.7V 18650 Lithium Li-ion Battery Charger Module DIY Power Bank | eBay
Amazon.com: Blomiky 2 Pack 3.7V USB Charger Cable with SM-2P Plug Connector for Mini RC Amphibious Stunt Car Boat Trucks 3.7V Li-ion and Li-Po Battery / 3.7V USB 2 : Toys &
Lithium 3A battery charger module with USB type C connector - Kamami on-line store