E-switch in the tailcap mod via additional button cell

[Lexel]

Here is a topic for eswitch modding

Electronic switch at the tailcap - how?

Most flashlights with an electronic/momentary switch have that switch at the side, where the driver and the LED sit. However there are a few flashlights with such a switch at the tailcap, like the ThruNite Scorpion, or the NiteIze IQ-switch for minimags. But how does that work? The main problem for electronics in the tailcap is that it does not have direct access to the positive battery terminal, so how is it powered? I've seen a light with a special 3*AAA battery carrier which got both termina…

Just add a bleeder parallel to LED and a charge resistor in front of the small battery