Have you already got batteries and chargers etc?
Yes I already have 18650 batteries
Thanks guys I'll look at the LuckySun D80 - wasn't aware of this

Have you already got batteries and chargers etc?
The switch only controls on/off, the mode-switching is done by a chip in the driver circuit.
You could try opening the head/driver and seeing if the chip (should be an 8-pin SOIC) has lost the magic smoke or is properly soldered to the board.
how long do 18650s normally last when they're just sitting in the torch?