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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    \$\begingroup\$ They say there is a risk of short circuit if charging a cell which was abused in this way. The ~0V cell is already damaged. That's why the charger intentionally rejects it. candlepowerforums.com/vb/… \$\endgroup\$ – akwky Jul 24 at 10:38
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    \$\begingroup\$ Second life ... as a firework? \$\endgroup\$ – Brian Drummond Jul 24 at 10:40
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    \$\begingroup\$ You can try, but please do it in a metal container in a well-ventilated area because it will probably explode. \$\endgroup\$ – user253751 Jul 24 at 10:55
  • \$\begingroup\$ 0V is not nearly dead. 3V is nearly dead. \$\endgroup\$ – DKNguyen Jul 24 at 14:22

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