My 1st Smart Charger, Vapcell S4+ 2.0….Attempt Dead Battery Repair?

[GDF]

@Jerommel

You can attempt reviving cells, as long as you do it where it’s safe.
I assume the ‘repair mode’ doesn’t use high currents and gives up if there’s no recharging going on and / or internal short circuit is detected.

Cells that have slowly discharged to 1 Volt or so (like from a battery pack with a protection and / or constant balancing circuit), but still hold that Voltage ought to be okay to revive.

It’s cells that have 0 Volts and have developed an internal short circuit (Copper dendrites i.i.r.c.) that only fools like myself would try to revive, by pulsing bursts of high charging current to melt the short circuits and then charge them normally.
It’s how i resurrected a hardly used Aspire 18350 after it was drained to 0.0 Volts in an e-switch light.
It didn’t take any charge anymore either, it measured 0 Ohms resistance on a multimeter.
The pulsing with high current i did outside, of course.
The cell did heat up a bit because of it.
But it was like 2.5 Volts at that point and it kept that Voltage like it ought to.
The cell is still in use today and didn’t lose any capacity or gain internal resistance.
In fact (for what it’s worth) according to the Liitokala NOR test it even gained a bit of capacity !

I.m.h.o. people often underestimate the abuse high quality cells are able to endure without the risk of venting, fire or explosion.
I have no experience with overcharging Li-Ion cells though, and i plan to keep it that way.
But as far as i know the problems and accidents that do occur rarely involve high quality cells charged by high quality dedicated charging circuits, except for E-vehicles., apparently.
I really wonder what causes those problems.
You’d think all necessary fail safes are built into those systems.

That sounds like the pulse chargers you can buy for for reviving lead acid batteries. I have a Vapcell 18350 that got discharged to 0.0 Volts in a Sofirn SC31 Pro (tested with multimeter). The battery was newish, and I attempted to revive it with a trickle charger. It didn’t work, but I’ve revived other discharged batteries with the trickle method, but they at least had some measurable voltage. I don’t recommend trying this of course.