Just an FYI that I found these cheap Duracell lights actually have an integrated shelf for the led star and driver and make a great host to mod, would easily take an 18500, could be a good project for some of you……
looks a lot like a clone of a convoy s2
I assume it is more akin to 26650 in diameter, no way to fit 3 batteries inside otherside. Thus quite a bit fatter than a Convoy S2.
The link from the op doesn’t work any longer. But a quick Google suggests these are £12.99
Rationally that is more expensive than buying a Convoy S2+ but I can see there may be some appeal in modding one. It isn’t a huge amount of money. Would be nice to see what the quality is like on them in terms of machining, threads and anodising. I suspect it may feel rather cheap however.
Link in OP post wasn’t working for me.
Takes 3 C sized cells. Sounds like a huge s2 clone with only 182 lumen. Not really impressive specs for a light that size.
I think it is 3xAAA not C cell 
Pic of the aaa carrier anyone?