"Jeff Liebermann" wrote in message
...
On Wed, 15 Nov 2017 18:52:06 -0000, "Ian Field"
wrote:



"Jeff Liebermann" wrote in message
. ..
On Tue, 14 Nov 2017 19:22:17 -0000, "Ian Field"
wrote:

Just curious about the failure mode - the cells really weren't worked
that
hard.

Here's how to fix it:
https://www.youtube.com/watch?v=IhUtKvCV6fs
https://www.youtube.com/watch?v=1w3Tv1Jg0ps

Every day is a school day.

That's another variation on my "Learn by Destroying". If you haven't
destroyed it, you don't understand it. My skool education was very
much like that. I would break something, and then take it apart to
see how it works. The skool would frown upon me taking apart
something that was still working, but offered little resistance if I
took apart something that was broken.

The first powerbank I bought got destroyed by my curiosity - the second
donated its PCB to an LED bicycle light that I converted to lithium. Just
bought another to sit on the shelf just in case.


I might have to rummage those cells out of the bin and do an autopsy - but
conscious enough of potential hazards to not bother re using them though.

Bin? Don't you have a local recycling facility that takes batteries?

Plenty replacements to hand, I just assembled another battery pack - but
that seems to answer my question; what happened.

It might answer what happened, but not why. I've had brand new
battery packs, assembled by a reputable and experienced rebuilder,
trip the protector for no obvious reason. I recently had one go open
circuit during charging, which might offer a clue.

I suspect the charger - but it hasn't damaged any of the other batteries
rotated through it.

The cell I peeled had what looked like a popper disc in the top, but it was
malleable instead of springy - I suspect "resetting" it would compromise
safety.