Wellp, just like protected cells, cells-with-chargers need the “sense strip” running down the side, only this time it just doesn’t sense voltage in the cell, but needs to carry enough current to charge it.
If well-designed, that shouldn’t be an issue, but it’s something to keep in mind.
The only one I have is also a Nitefox, and it clocked in at or above the rated capacity (2600mAH?). It already had a pretty good charge in it, so topping it off didn’t take too long, and it didn’t heat up that I could tell.
I can see where it could come in really handy if you have a light that doesn’t include a charger. Eg, on a business trip, on vacation, whatever.
Wellp, that’s a function of the light, not the cell. Even if reversed, a “protected” cell will happily try to fry the driver, as it doesn’t know the difference.
I know the v2 has RVP. I was trying it out, had some NexTorch cells on the table, and grabbed one but the bands were kinda confusing, and I absentmindedly put it in backwards. Light doesn’t work. Bah…
Took out the cell. Whoops! Now I see it…
Back in the right way, light works great.