My diy 18650 Charger (more info in comments) : r/18650masterrace
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Amazon.com: AITRIP 6PCS 2A USB 18650 Lithium Li-ion Battery Charger Module Boost 3.7V to 5V 9V 12V Adjustable DC-DC Step Up Boost Module TP4056 DIY Kit Parts : Electronics
![Free STL file [DIY] 18650 Battery Charger・Design to download and 3D print・Cults](https://files.cults3d.com/uploaders/14213834/illustration-file/c5631396-24be-4231-9e03-a45332b842a9/20210306_133201.jpg "Free STL file [DIY] 18650 Battery Charger・Design to download and 3D print・Cults")