18650 Li-ion battery
The 18650 lithium-ion battery is 3.7V per battery, 4.2V when fully charged. Unlike an alkaline battery, a lithium ion battery can be used as a rechargeable battery and has a large battery capacity. But be careful of the impact. There is a risk of fire if the battery is stung or shocked by sharp objects.
I used FAIRMAN Lithium Ion battery, which has a built-in circuit per battery, which is slightly larger than a regular lithium ion battery. Prior to making the battery pack, the FAIRMAN battery already has a built-in protection circuit. I wonder if it’s ok to connect the protection circuit, but let’s try the experiment first.
protect circuit
wiring diagram
So let’s make a battery pack once.
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