I bought a bike headlight, the Enfitnix Navi800, because I liked the beam shape, replaceable battery, and on-board charging. But the battery, despite the "18650" written on the label, isn't like any I've seen so far. It has flat ends but the positive and negative terminals are both on the same end, with positive in the center.
Is there a name for this type of battery that I can search for? Or is it unique to Enfitnix?
looks a lot like streamlight battery, for old strion model, and possibly other models too, i've seen cells like that on other brands as well, they are not common, but occasionally you come across one like that.
It would easy to make a little circuit board with the concentric positive and negative terminals, then rewrap after making a solder connection from the side of the case to the negative ring. The positive would just be a straight feed-thru that makes contact with the button top.