I have a 7.4V battery pack consisting of 2 x 18650 cells. One of them has 3.4 V, so I tried to charge it with a good old TP4056 board, and it worked: The second 18650 cell seems nearly dead with ~ 0.1V. When I connect the TP4056 charging board, it doesn't seem to charge (blue light: full). Is there a way to give an initial "boost" to a dying 18650 cell, to bring it to 2.5 V, so that eventually a TP4056 charging board will recover it?

Give a second life to a 18650 battery cell, which has 0.1 V?

Electrical Engineering Asked on December 26, 2021

I have a 7.4V battery pack consisting of 2 x 18650 cells.

One of them has 3.4 V, so I tried to charge it with a good old TP4056 board, and it worked:
The second 18650 cell seems nearly dead with ~ 0.1V. When I connect the TP4056 charging board, it doesn’t seem to charge (blue light: full).

Is there a way to give an initial "boost" to a dying 18650 cell, to bring it to 2.5 V, so that eventually a TP4056 charging board will recover it?

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