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Harvesting Issue
#1
Have a question for the more experienced battery harvesters.
I have been harvesting some old cells and found a few that have a hole from where the weld pulled the bottom case open.
Is this safe to charge and use?
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#2
Don't use, discharge and recycle, twisting instead of pulling the tabs off might work better
Later floyd
use a flush cut pliers
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#3
Bin them. No damage what so ever is allowed that is visible.
If that happens cut the strip off instead. Its a common issue on ebikes and high power packs where the welds often are stronger.
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#4
Also, if you smell something sweet/fruity.... you're not imagining it - that's hazardous electrolyte leaking somewhere. Find it, [plug it], discharge it slowly, recycle it.
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#5
Thank you all.
I suspected as much that it would be a recycle bin item.
Just hate wasting cells that are now getting harder to come by in my area.
Now that laptops are coming with flat weaker lithium ion phosphate batteries.
I have come up with a nice disposing method as well.. Rapping the battery in a 21700 shrink wrap with an full insulator ring with center. That way i know it is done for and safe.
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#6
Yup, toss it. not worth the risk.
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#7
Although I agree with you from a safety perspective, I don't recycle them if they test fine.
That lower part is insignificant from the general p.o.v.
I won't use them in packs but for many other applications they're perfectly fine.
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#8
(09-16-2020, 11:49 AM)Overmind Wrote: Although I agree with you from a safety perspective, I don't recycle them if they test fine.
That lower part is insignificant from the general p.o.v.
I won't use them in packs but for many other applications they're perfectly fine.

If there are holes in the cell during charging and discharging or even just sitting there, toxic and flammable gases may escape.

Seeing that they are used in and near electronics or even a flashlight, you run the risk of a fire (or worse)
You also don't want to breath the gases.

I would tape the ends and toss them.  Trying to discharge them is too dangerous. (such as HF)

From Wiki --> Hydrogen fluoride is a highly dangerous gas, forming corrosive and penetrating hydrofluoric acid upon contact with moisture. The gas can also cause blindness by rapid destruction of the corneas.
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#9
Yes, hydrogen fluoride (HF) may be generated, generally between 20 and 200 mg/Wh of nominal battery energy capacity.
On top of that, 15–25 mg/Wh of another potentially toxic gas, phosphoryl fluoride (POF3),

But the bottom end does not trigger that. In fact, with some skill, you can completely remove it (at least for some brands of cells, I'll try to recall with what type I did that) without triggering a gas release.
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#10
I haven't kept any of the cells that have holes pulled in them but I'm wondering if they would be salvageable if they are used in a soldered application instead of welded with the solder covering and filling the hole?
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