Neat power bank with unusual "anti-burn" polarity protection

The "anti-burn" feature of this power bank is not just polarity protection for the circuitry, but also polarity protection for the cells, so that if they are inserted incorrectly they will not short each other out.

Obviously I had to test that.

I was expecting it to be something very simple like a PTC fuse for each cell, or possibly the classic single MOSFET polarity protector, but it's actually quite clever, because it is dealing with two independent cells.

This unit came from AliExpress (not a sponsor). If you want one then here's a link.
This is an affiliate link, but that will not affect the price you pay.
https://s.click.aliexpress.com/e/_c3hNBeJP



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