Not to sound offensive or disrepectful, but those lights you are talking about can pretty much be purchased in a dollar store. They are pretty much meant to be nothing more than a cheap and disposable item/gift. I would not trust the battery at all that they sent with them, and would use the cage and 3 x aa batteries instead. The battery that was sent with it is made from the cheapest Chinese cells that can be sourced, and manufactured by the cheapest labor with the poorest if any qc. I would keep the light and use aa's with it, but dispose of the 18650.
Hey Rob I’m just curious what is it you enjoy about flashlights so much? Never heard of people collecting them or a forum for them. I guess people collect random things but what is it you enjoy about it if you don’t mind me asking?