well I guess it is possible to drive MT-G2 from a single 26650 battery… we need someone here at BLF to create this driver 
Nothing new here. We already have boost drivers that can do this, but not at the amps we really want. With an MT-G2 we would all like 5A-6A, not 1.5A-2A like this light appears to be driven.
Time to make us a 17mm 5-amp boost driver RMM!!! I have faith in your design skills! :bigsmile:
I think that C_K is probably working on one, maybe Wight too (he's much better and determined at this design stuff than I am)? I really lack the time to really design these things. I have a few boost drivers sketched out on paper, but the probability of them actually working is probably similar to winning the lottery. Once you get to high-powered, high-frequency boost and buck drivers things become more complex than just hooking parts together with traces and calling it a day.
I think that a 5A boost in a 17mm driver is going to be a stretch thermally and size-wise, but it could theoretically work for short bursts. It would be pretty awesome, even for XM-L2s.
For an MT-G2 you can get away with the crappiest boost and buck drivers known to man as long as they turn on and hold together because they can handle a ton of voltage ripple. XM-L2s aren't nearly as tough so your driver has to be a lot better.
I’ll be happy enough if I can get a driver that can drive MT-G2 in a single battery light at 3-3.5A , know any driver I can use ( maybe you sell them)?
Me too actually. I have a modded Sunwayman C20C equipped with a 3-amp zener diode driver and powering an MTG2. I’d love to be able to run this light on a single cell.