My DIY 18650 Battery Charger

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/_c2zG2mSd
10W 10R resistor (type a): https://s.click.aliexpress.com/e/_DDqDvtx
10W 10R resistor (type b): https://s.click.aliexpress.com/e/_Dd6stuH
TP4056 module: https://s.click.aliexpress.com/e/_c3BSjJ2j
Battery Holder: https://goo.gl/iCaigG
5mm LED assorted kit: https://s.click.aliexpress.com/e/_c2xjC4Th
Double switch: https://s.click.aliexpress.com/e/_c3Awoc11
300 resistors kit: https://s.click.aliexpress.com/e/_ok59TEV

----------------- Music -----------------
Track: T-Mass - Ignoring My Heart [NCS Release]
Music provided by NoCopyrightSounds.
Watch: https://youtu.be/eT0tYnWX2sQ
Free Download / Stream: http://ncs.io/ignoringmyheartYO

Track: Kozah - Haha [NCS Release]
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Watch: https://www.youtube.com/watch?v=vVblNX7YSdU
Free Download / Stream: http://ncs.io/HahaYO

Track: ÉWN - Feels (Original Mix)
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Watch: https://www.youtube.com/watch?v=ZevEW7zwslA
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Track: Raven & Kreyn - So Happy [NCS Official Video]
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Watch: https://youtu.be/cmVdgWL5548
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Track: Andromedik - Firefly [NCS Release]
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Watch: https://youtu.be/UPzCs-J4AUU
Free Download / Stream: http://ncs.io/FireflyYO