Xiaomi style battery charger. Near disaster today – flames – when I put a battery in

+1

Here is some pictures of both sides, maybe the “crack” at the side on the top had something to do with it? Of course, that could have happened when I trow it in the ground to getting the battery out…

[quote=myhken]

That sounds like the correct explanation.

You are the real expert here, when you see the pictures here… and the rest I have posted. Do it seems like I put the battery in the wrong way?
My Multimeter says the battery has 4.2V still, but why risk it. I just trow it away. I have plenty others.

But really, you can see the melted plastic on the negative side on the battery, and that the positive side is perfectly fine. If I had put it in the wrong way, how could I get melted plastic on the back of the battery (then facing the positive side on the PB) when my pictures clearly shows that there is no damage at all on the positive side of the PB, just on the negative side, there the negative side of the battery was.

[quote=HKJ]

Thank you, if it was to me you wrote it.

Put it outside the house in a metal container (or in a bucket of water) and recycle it properly.

Yes, and one of the outer turns of the spring got a connection through the crack in the isolation on the battery.

Of course, having it in my fireplace is just to keep my house safe. I also have a box of batteries to I have got (like Ultrafire and the 5000mAh blue battery from Gearbest.com) that I’m going to take to the recycle center next week.

But why is the melted plastic on the negative side of the battery? Do you see any damage to the positive side of the power bank?
And you can see the melted plastic on the negative side of the battery, and there is not any thing on the positive side of the battery?
Still, you think I put it in the wrong way? How did the melted plastic and burn marks come on the negative side of the battery then?

+2.
You buy cheap crap hoping for a good outcome, then seem shocked when it is indeed a crap product. Now you are playing with ‘fire’. What amazes me almost more is the support you are getting for this repeated behavior. You’ve been warned off numerous times.
Come on, a 4-battery power bank for $6? You can barely get a decent single for that. You already knew that and did it anyway.

Remember something it has been on it’s way before I joined this forum. And how can you call this crap, when the price seems right for this product?
http://www.gearbest.com/chargers/pp_186601.html (it’s $6/pcs for an empty shell)

And I did use a Sanyo UR18650ZY battery, that is not a crap or cheap brand. So how could I see this come?

I have used this forum and other now to get better information about products, stores and sellers, and have ordered lots of quality stuff after I joined here.
But the power bank was ordered from Gearbest.com, and I have no information about they selling crap. Before I got the blue 5000 mAh batteries (of course, I knew they was not 5000) and now the power bank shells. But now I know that I can’t trust Gearbest.com for good quality either, like Ebay, Aliexpress and any other site.

Maybe it is my first explanation then. There is no mystery why the spring got hot, there the wires are close together and will help heat each other.

If you have a ohmmeter check the resistance from + to - in the box, if it shows nearly the same value as shorted probes, then the box is shorted.

If the box wasn’t defective from the get go, I’m thinking it’s still good now. If the box is shorted all of the springs would be damaged. The short had to be the cell.

I would also expect that.

The problem is with the heat damage at the back of the cell and the front do look undamaged.

There is nothing at the back of the cell that can short (Except on a protected battery).

At the front it is possible to short the cell and fairly easy if the wrapper is damaged.

I.e. there are two way you can get the short, either from the centre to the can at the front of the cell or from the centre at the front and all the way around to the back of the cell.

Was that battery in in your BT-3100 when it heated up and stopped working?

wow… that’s insane… I’m glad it didn’t explode!
Although this doesn’t take 18650s, I wonder if the Fujitsu FSC341FX works better (if you can find it, that is)…

This is why I originally thought that there already was another cell inserted adjacent and was popped up so that the cell case was shorting the + and - connectors of the box. Then as the cell in question was inserted it shorted out through the case of the improperly inserted cell adjacent to it. That is the only scenario I can think of that explains the spring, the negative end of the cell etc.

Risk was very low for that, good LiIon batteries must not exploded when shorted. They may vent and if there is a spark or very hot metal the venting gas can ignite (This is not good).

No, there I had only protected cells. But this battery has been tested both in the Lii500 and C3100 (before it got broken). But so has many of the batteries I use daily. And there was no damage to the batteries that was in the charger when it broke. They checks out with Volts and actual mAh after several round of testing on Lii500. and using a Multimeter, and using my iMAX B6 80W.

Thats good new, I was afraid it would, so thats why I trow it away right away. The battery still smells burned, I have had it on my table now for the last hour or so, while I have taken the pictures, so maybe two hours. And it smells electrical burn from it. But it’s not hot or something, and the Voltage is still 4.20 (tested just now). Is any danger to have it on my table, or should I put it back into my fireplace there it’s safe?

As long as it is cool, there is no danger.