Hello everyone! I was planning on making my own Li-ion battery charger using the TP4056. My setup for my charger is quite simple, I had my TP4056 hooked up to a 3.7V Li-ion battery (3100mAh), and I plugged the input of the TP4056 with my (5V, 2.5A) power supply. I had measured the battery voltage w…

srnet: Without seeing a circuit diagram and picture of how you have it connected, how can anyone say ? My bad on that part. I have uploaded a picture of the circuit and the circuit diagram. Thanks for the response.

Was there something that I missed in the setup? Why were you expecting 600 mA? The battery is partially charged, and the regulator is probably doing its job correctly. Li-ion discharge curves: [image]

The current you measured is within the range of expected behavior for a trickle charge. I'm not familiar with the chip or module you're using, but it seems to be selectable on whether to go constant current or constant voltage. Pay attention to the time curve.

The current you measured is within the range of expected behavior for a trickle charge. Nope, not for Li-ion chemistry, and that battery. BU-409: Charging Lithium-ion - Battery University [image]

jremington: Why were you expecting 600 mA? The battery is partially charged, and the regulator is probably doing its job correctly. When i checked the capacity chart for the battery that i was using, i found that 3.75V is the voltage when the battery is nearly empty. Then according to the I-V ch…

I do not believe that chart. Manufacturers very often misrepresent their batteries. See the link in reply #6 for charge/discharge behavior. The important thing to know is how the charger behaves over one or more complete charge/discharge cycles. Please continue with your experimentation!

jremington: Nope, not for Li-ion chemistry, and that battery. BU-409: Charging Lithium-ion - Battery University Who are you responding to? Obviously not me, because my point was pointing out that if the chip can be put into constant current trickle charge, then whatever your point is bringing up…

I think the issue i am having now is the confusion on the trickle charge. When i connected the battery to a li-ion charger which i purchased from the same manufacturer, it indicated that the capacity was somewhere between 30-70%, which should still be in the range where the charge current is high. I…

TP4056 to charge 3.7V Li-ion battery

Projects General Guidance

srnet March 24, 2018, 3:16pm 2

witheredfish:
Any idea on what may be going on here?

Without seeing a circuit diagram and picture of how you have it connected, how can anyone say ?

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TP4056 to charge 3.7V Li-ion battery

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