1 Thank
You mentioned that you couldn’t get it to work on 1 battery - unlike some/most of the dual side by side battery lights (SK05, etc), the X1 Pro arranges the battery in series for higher voltage.
So only having one battery will not produce sufficient voltage for the driver.
Yes. but, in the case of the cells being in series installing only one cell will not provide any voltage to the driver..
Yes, I was responding to Darren’s comment in his video that the light falling to operate on 1 cell might be some sort of defect or bug.
It’s not supposed to work on 1 cell and is operating as intended.
1 Thank
Thanks for the explanation! It’s a bit odd because I did eventually get it to work on one battery but when I turn it off and on again or remove/ insert the battery, it stops working. But yes, probably not designed to work with a single cell
1 Thank
Just for discussions sake. If it ever worked with only one cell installed, it must not use the cells in a purely series configuration .
Think about a 2 18650 or 21700 tube type light. If you take one cell out… unless you put a dummy cell in, it can never produce light.
All the current has to go through both cells in a series configuration.
It would be interesting to know what exactly they are doing with the X1.
Just rambling here… don’t mind me.
Yeah it’s odd, it will work intermittently with one cell and I can’t seem to find a way to reliably replicate it. I just mash buttons, take the battery in and out into different slots, then at some point it will turn on.
It’s possible that the balancing circuit passes a little current, but I don’t recommend trying it. @TimMc fried his balancing circuit with reverse voltage btw.
1 Thank
Oof, a flashlight that expensive should be foolproof. So they only have safety through the battery-contacts that are flat and shouldn’t touch the poles if the batteries are put in the wrong way, but obviously it doesn’T always work
It has a mechanical reverse polarity protection, but that doesn’t help when you’re not using batteries, but other ways of powering the light. 
1 Thank