With the growing popularity of mini lithium jump starters for cars, there seems to be some standard components appearing. One of them is this set of plug-in wires with this mysterious little box on one of them. So here's what's in it.
I have not yet taken a look at the jump starters because I do not have enough charge to test them to their often dubious specifications.
Note that there were two types of packages in the unit, one with a rating of 40V and a 45V.
Jerry Korner did some tests, so here is a link to one of his test videos.
It seems that there has been a reminder on some of these leads because of the exact scenario that I have described overcurrent and causing a short circuit of the diodes, followed by a rapid failure of the lithium pack .
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Video credits to bigclivedotcom YouTube channel