In Stock 4.2V Single Cell Lithium Ion Battery smart chargers, 3.6V or 3.7V cells, charging at 4.2V 800mA for OEMs
Amazon.com: EIKS Universal AC/DC 4.2V 1A Power Adapter Wall Charger for 18650 Battery LED Strip Shaver Groomer Clipper, with 8 Selectable Tips (4.2V-1A) : Electronics
Adafruit Micro Lipo - USB LiIon/LiPoly charger [v2] : ID 1304 : $5.95 : Adafruit Industries, Unique & fun DIY electronics and kits
SuPower Li ion Li Po 1S 3.6V 3.7V 4.2V 3A Lithium Ion LiPolymer Wall Socket Battery Pack Charger auto stop AC DC Power Supply|battery pack charger|batteries battery chargerbattery charger - AliExpress
Amazon.com: LM YN 4.2V 1A Power Adapter Li-ion Battery Charger with LED Indicator 5.5 x 2.5 2.1mm DC Interface Suitable for 3.7V 4.2V 1-String Lithium Battery Pack : Electronics