With the increasing popularity of the mini lithium jump starters for cars, there seem to be some standard components appearing. One of them is this set of plug-in leads with that mysterious little box on one of them. So here’s what’s inside.
I’ve not taken a look at a jump starters yet as I don’t have a load high enough to test them to their often dubious specifications.
Note that there were two types of package in the unit, one with a rating of 40V and one 45V.
Jerry Korner has done some tests though, so here’s a link to one of his test videos.
It appears that there has been a recall on some of these leads due to the exact scenario I described of overcranking and causing the diodes to fail short circuit, followed by rapid failure of the lithium pack.
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