While quite neat, this light could be looked on as a project for making a better and longer lasting version.  It's supplied with a suspiciously low capacity 14500 lithium cell.  The number means 14mm diameter and 50.0mm long, and these normally have a capacity of around 750mAh, so the 280mAh measured is well short of the desired capacity.  That makes it an easy upgrade to just put in a new cell - preferably one with solder tags, as soldering directly to a lithium cell like this is a bit taboo due to the risk of heat damaging the internal separator.

There's also a position inside for an alternative rectangular cell with a rough dimension of 30mm by 40mm by 7mm.  If the plastic cell guides are carefully cut out it could be possible to get a bigger cell in, including ones salvaged from disposable vapour devices.  It should be viable to get a 1500mAh cell in to get five times the run time.

Note that the LED PCB needs to have the glue cracked and then the PCB rotated to align the slots with the threaded sides to come out easily.

When tested on a bench supply the current was:-

4.2V - high=200mA medium=125mA low=60mA
3.7V - high=150mA medium=93mA low=43mA
3.0V - high=58mA medium=37mA low=17mA

Processor cuts off at 2.4V

Quite a nice light with potential as the base for a custom project.


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