Most compact TP4056 Li-ion 18650 charger
thingiverse
Most compact 18650 charger for cheap TP4056 module (https://www.banggood.com/20X-TP4056-5V-1A-Lipo-Battery-Mini-USB-Charging-Board-Charger-Module-p-1095077.html?rmmds=myorder) To complete this project, you will need a few essential components. First, acquire a small length of Nickel Strips (https://www.banggood.com/30pcs-Nickel-Plated-Steel-Sheet-Strap-Strip-For-Battery-Spot-Welding-0_1X4X100mm-p-982026.html?rmmds=myorder), which will be used for spot welding the battery to the charger. Additionally, you will require a standard flashlight spring (https://www.banggood.com/Phosphorus-Bronze-Spring-Flashlight-Spring-Conical-Compression-Spring-p-86054.html?rmmds=search) to ensure proper contact between the battery and the charger. Lastly, obtain some wire to connect all the components together.
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