USB powered li-Ion charger for 18650 battery
thingiverse
It's a basic holder for 18650 batteries. The charging circuit is based on the TP4056 chip, different models exist, take the cheapest. Search for "TP4056 USB Li-ION Battery Charger" to find a provider on the net. Spring was retrieved from an old battery holder. There is a small slot to hold and block the spring. For the positive side, strip the cable on 2/3 cm, make a small ball with the wires, put solder on it and press on the plastic when hot. The.scad file is available if you want to change some sizes.
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