Ni-Mh cell with white dust/powder in positive pole

[hank]

Wear your safety eye protection when you do this kind of thing.
And remember the 12V Auto battery should not be used near electrical sparks.

[samgalax]

Muahahahah no… No safety glasses at all. ( I am crazy!)

[Lightbringer]

@hank

Wear your safety eye protection when you do this kind of thing.

As we learn from our Ukrainian friends, pool goggles, shorts, and flip-flops should be sufficient safety gear.

Wait… they’re not lithium cells, so you can be butt nekkid and do whatever you want. You’re good.

[Jerommel]

@Jerommel

Yeah, hitting a cell with 12 Volts or something can surely work.
I had an Aspire 18350 drained to the bone (zero volts), and then i hit it with short 12 Volts bursts from a lead acid battery, making sparks and the battery got pretty warm too, and i stopped when it had reached 2.7 Volts or something, and then i gave it 2 charging cycles, and it seems to have worked well enough.

Wait, i’ll put it in the charger for a NOR test.
(I’ll report back on it)

Wow, it’s still 1135mAh according to the Lii-500. :+1:

(which discharges down to 2.8 Volts by the way)

[Pete7874]

@Jerommel

@Jerommel

Yeah, hitting a cell with 12 Volts or something can surely work.
I had an Aspire 18350 drained to the bone (zero volts), and then i hit it with short 12 Volts bursts from a lead acid battery, making sparks and the battery got pretty warm too, and i stopped when it had reached 2.7 Volts or something, and then i gave it 2 charging cycles, and it seems to have worked well enough.

Wait, i’ll put it in the charger for a NOR test.
(I’ll report back on it)

Wow, it’s still 1135mAh according to the Lii-500. :+1:

(which discharges down to 2.8 Volts by the way)

Wow, your Aspire has more capacity now, after being drained to 0, than mine ever did when new.

[Jerommel]

@Pete7874

@Jerommel

@Jerommel

Yeah, hitting a cell with 12 Volts or something can surely work.
I had an Aspire 18350 drained to the bone (zero volts), and then i hit it with short 12 Volts bursts from a lead acid battery, making sparks and the battery got pretty warm too, and i stopped when it had reached 2.7 Volts or something, and then i gave it 2 charging cycles, and it seems to have worked well enough.

Wait, i’ll put it in the charger for a NOR test.
(I’ll report back on it)

Wow, it’s still 1135mAh according to the Lii-500. :+1:

(which discharges down to 2.8 Volts by the way)

Wow, your Aspire has more capacity now, after being drained to 0, than mine ever did when new.

Yeah, when i got them new i NOR tested them and wrote the capacity on them, and this one was 1072 mAh.
But i haven’t used them that much, but they say that after the first few cycles the maximum capacity is reached.
This seems to be true then.
But apparently the worst possible over-discharging (it was really 0.0 Volts) didn’t harm this little fellow at all !
Maybe it was the shock therapy that made it behave so well?

[Barkuti]

Honestly speaking, using a few Ohms resistor as one of the jumper lead wires can limit the current enough for the experience to be a lot gentler.

@Lightbringer

…

As we learn from our Ukrainian friends, pool goggles, shorts, and flip-flops should be sufficient safety gear.

Wait... they're not lithium cells, so you can be butt nekkid and do whatever you want. You're good.

[Jerommel]

I don’t know if it should have been gentler.
In my case, i first tried it with a half charged VTC6, which didn’t seem to do much.
So then i put some leads on my 12 Volt sealed lead acid battery (not a car battery, but an old 12000 mAh Reliart® by Yuasa®) and just pulsed it (which produced sparks, of course) until it was within range to be recognized as a Li-ion by my charger.
So i gave it very very short pulses, like 0.05 seconds per pulse (guesstimated).