This is Dual Micro USB 3.7V to 5V and 2A mobile power bank DIY 18650 Lithium Battery Charger Module with LED. This module is mobile power accessories it contains 18650 circuit board shells.
It will plug parallel to batteries. Its voltages are between 3.2V to 4.2V. it contains a polymer battery.
Then the batteries are connected to the motherboard.
There new and old batteries that cannot be mixed.
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Power Banks
How Power Bank Module Works?
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