Dodgy LED head torch with no lithium charge limiting.

Having quite liked the previous version of this I did a video of, I got a couple more from different suppliers for comparison.
One of them (the black one) is similar, but has a different PCB and protection circuitry on its cell. The other, which is white and quite boxy has absolutely no charge protection of the cell at all, with the possibility that it can be charged up to well above 4.2V. (Theoretically all the way to 5V if the lithium cell can get that far.)

This is a link to the black version that seems to have two layers of charge protection:- http://www.ebay.co.uk/itm/111792279982


And here's a link to the very dubious white one that appears to have no lithium cell overcharge protection at all! Note that this light may pose a genuine hazard! In fact as an extra safeguard against anyone accidentally selecting this link thinking it's a good one, I've deliberately butchered it with an X in the middle of the item number that will need to be removed to make a valid link.

http://www.ebay.co.uk/itm/231732X413703