Adafruit Universal USB / DC / Solar Lithium Ion/Polymer charger [bq24074] : ID 4755 : $14.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Lithium-Ion Battery Charger Circuit using MCP73831
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LCD 3.7V Li-ion Lithium Dual USB 18650 Battery Charger Module 5V 2A Power Bank | eBay
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