This model light (Shadow JM35) has always worked in the SINGLE CELL configuration. It was first launched without any extension tube option as a Single cell ONLY version for both MTG2, then XHP-50 options. It uses a boost driver and has been reviewed and discussed extensively here on BLF. (see M4D M4X's review). I think this was one of the main unique selling-points.
I saw no reason why the new revision of the same model (just now has dual-switch and extension tube) should be any different. If it was not capable of operating on a single-cell (always requires two cells), why did they bother with an 'extension-tube', and photograph it in the shortened configuration?...
Bizarrely the listing does now state "Note: Please do not use protective 26650 battery for this flashlight.Can not use 1x 26650 battery."
I had previously assumed that Banggood were just mistaken, until I saw your post above.
Now, if what you're saying is correct, this is just a badly designed light and backwards step compared to the previous JM35 version!
