Today I'm going to show you how I've build a more complex 18650 battery charger. I got all the electronic components from banggood.com. I tested all the components before starting the project and they are all ok. The electronic parts cost 6.5 euros / battery.

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The schematic for one cell: https://i.imgur.com/2xnGHoK.jpg
The schematic for 4 cells: https://i.imgur.com/ozW1mv7.jpg

Parts list:
32V small digital voltmeter: https://s.click.aliexpress.com/e/_DmD...
10W 10R resistor (type a): https://s.click.aliexpress.com/e/_DDq...
10W 10ohm resistor (type b): https://s.click.aliexpress.com/e/_DDn...
TP4056 charging module: https://s.click.aliexpress.com/e/_9hTxou
Battery Holder: https://goo.gl/iCaigG
5mm LED assorted kit: https://s.click.aliexpress.com/e/_DDw...
Double switch: https://s.click.aliexpress.com/e/_DdQ...
300 resistors kit: https://s.click.aliexpress.com/e/_DEf...

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