How to Make 18650 Li-ion Charger Station for a Budget

A lithium-ion battery or Li-ion battery (abbreviated as LIB) is a type of rechargeable battery in which lithium ions move from the negative electrode to the positive electrode during discharge and back when charging. Li-ion batteries use an intercalated lithium compound as one electrode material, compared to the metallic lithium used in a non-rechargeable lithium battery. The electrolyte, which allows for ionic movement, and the two electrodes are the constituent components of a lithium-ion battery cell.
Lithium-ion batteries are common in home electronics. They are one of the most popular types of rechargeable batteries for portable electronics. Because there are so popular i decided to make a cheap charger that everybody

can replicate at home.For this project we going to need the following stuff:

Some charge board module for charge control the battery 4.2v fully charged 3.7v nominal and 3.0v empty

18650 Battery holders

Case or cardboard

wires

So let's get started

I take the battery from Poundshop power banks and inside these 1£ power bank there is the small module,

the battery, plastic casing, some rope wire thing and for a small application these batteries are more then ok

this is written on them 18650 1200Mah but i don't think for that price is the actual power but 900Mah is good enough

for lights, small motors like pc fan, relay, radio, charge the smartphone with 4xbattery 2 times fully charged

and manage to power multiple USB devices for a couple of hours.This charger that we will make charge the batteries 4 of them separately with 4 individual controllers

This is the module in charge of charging the 18650 to 4.2v and the stop the charging process

and they have an over protection of low voltage for 3.2v they flash a blue led and disconnect the power

they required a 5v power supply of approx 1A they are not polarity protected so if you connect the battery to wrong position boom the small charger is burned

All the stuff that you end up when you buy this power bank

First thing you have to solder wires like in the picture and just connect the charge module

according to the battery holder and remember do not reverse the battery

additional you can add some switches on all the modules

put the parallel connections and connect to the power supply

it has to be at least 5v 1.5A

As improvement, we can add a constant current tester

can be made by another power bank in between battery and controller connect the multimeter

as a load, we going to connect a USB lamp because in the discharging process is no need to lose the energy

we gonna power this USB light and a start-stop clock to record the time

At the end of the discharging process, we will find the capacity of battery by multiplying the time with the power consumption /60

Thanks for watching and please visit the channel on youtube.