Hello TorchWolf,
I apologize for the negative experience. Rest assured all Cubs were tested - with battery in place - before being shipped to Tactical Warehouse, who subsequently shipped the international-bound lights to yet a third party for individual foreign shipping.
It sounds as though the board is out of position and when pushed up *into* position by the battery, the switch is coming into partial contact with the internal wall of the control module housing. This is not a fault with the circuit.
Please ship the light back to me, at my expense, for examination and servicing. I will reposition the board so as to remain in place regardless and ensure all is working once again before returning the Cub to you, also at my expense.
Again I am sorry this happened. Next time feel free to contact me directly so I can take care of any issues more quickly. You may reply to this via e-mail (in my profile) to gain my attention sooner, as there is another flashlight forum that I have been frequenting (and helping to administrate) more than CPF lately, and thus I may not see your publicly posted complaint.
Thank you.