I modded my E-Power 18650 and removed the stock PCB and wiring. I installed a 3-Pin 5V regulated in the housing, using the switch housing as a whole as the heatsink (doesn't get too warm). I drilled vent holes in 4 locations around the parameter of the switch/cap/atty connector housing. I used a 1mm Tactile Switch on a PCB with a simple 3-pin 5v regulated circuit to send 5V to the atty connector. The unit will now fire anything. I love the E-Power.