VERTER 5V USB Buck-Boost - 500mA from 3V-5V / 1000ma from 5V-12V [TPS63060] : ID 2190 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits
A Lithium Battery Charger with Load Sharing | Zak's Electronics Blog
Adafruit Micro-Lipo Charger for LiPo/LiIon Batt w/MicroUSB Jack [v1] : ID 1904 : $6.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Lipo Charger - charging module for Li-Pol batteries via USB C - DFRobot DFR0668 Botland - Robotic Shop
Lipo Charger - charging module for Li-Pol batteries via microUSB - DFRobot DFR0667 Botland - Robotic Shop
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18650 LI-Ion Battery Charger and Dual USB 5V 2A Step Up Power Supply M – Envistia Mall
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Battery Technologies - SparkFun Learn
Impossible lipo charger - Project Guidance - Arduino Forum
3V To 5V 3 USB 18650 Lithium Battery Charging Module Step Up Boost Li-ion Lipo Battery Charge Circuit Board for Power Bank - AliExpress
Hobbyking™ Lipo to USB Charging Adapter - Hobbies Galore
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Battery Technologies - SparkFun Learn
3 USB 18650 Lithium Battery Charging Module Step Up Boost Li-ion Lipo Battery Charge Circuit Board for Power Bank 3V To 5V - AliExpress