How to Set up the above 3.7 V Li-ion Charger Circuit: That's extremely easy to implement. First, make sure the preset is moved at the ground side fully. Meaning, the pin#2 should be at ground level through the preset initially. Next, without any battery connected, apply an exact 4.2 V across the +/- supply lines of the circuit, through an.. Let your phone lithium-ion battery charge while you're sitting still—but don't overdo it. Tamarcus Brown/Unsplash SHARE. This story has been updated. It was originally published on 8/23/17.

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When I connect a battery to the TP4056, the battery fully charges and the TP4056 disconnects the power to the battery and the device starts to run from the battery. When the battery drains approx. 30 mV, it again starts charging until full. My device can run from 3.7 V to 4.2 V. Now I want to make it more reliable for my device.. Pinout of / how to charge that certain battery (Lithium-ion, 3.7 V, 2 Cells, parallel, 4400 mAh) 5.. Charging lithium-ion battery of 3.7 V. 1. Very long battery life with rechargeable lithium ion batteries. 1. Trickle charge an NiMH battery. 2. Maintaining health of Lithium-ion battery. 3.