I’ve had this BTU Shocker for about 2-3 months now. I like throw and love flood, this light actually throws further then I can use or see. But its old now and time for modding, all new lights are like shelf queens but when they get this old its time to mod. Changing to XM-L2 U2’s will give me about 10-15% more light and is quick and easy route. XM-L2 T6’s on copper are readily available and would be a quick change. Xm-L2 U2’s are a little harder to find, but no driver change needed. I’m hooked on MT-G2’s now and have 4 of them but no multi MT-G2 yet. Intl-outdoor has copper mounted MT-G2’s now and 3 of them at about 3 amps each would increase flood. Throw with these Led’s are only through sheer volume of light. Given that it run on 3-18650’s I can’t go hog wild on a mod. So given the limitations I think about 3 amps each will give a nice boost to output without any heat sink issues. Any input into the driver and any issues that I’ve over looked would be very much appreciated. This is my big plunge into modding.
MT-G2 is 6V right? 3A will be 18W each, that will make a 54W torch. :bigsmile:
I'm afraid you will not get 54W out of 3x18650 batteries, whatever you do. And the 3 batteries are parallel, right? So at least you will have to mod that to make it a series configuration, because there is no heavy duty boost driver around (yet) to get the voltage to the 6+ needed to drive the MT-G2. So here's a challenge 
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The carrier looks like the cells are in series. At 3A the MT-G2 has a VF of about 6.3-6.33V. So that is about 19V.
Would it be possible to wire 3 MT-G2s in parallel and run of the 3x 18650s in series? You would probably need IMR/high discharge cells for the high current.
You need about 9A output current to be shared by the MT-G2s.
What about running 6 x 18350 batteries to boost the voltage?
True, but with 6.5v output voltage and around 11v input that would only mean about 5 amps from each cell. NCR18650PDs should give over half an hour of that, and then there’s always low modes.
Then it needs another driver.
9a sst90 driver from lck led, wire the emitters in parallel, sorted
TaskLED HBFlex is probably the best boost driver available to hobbyists.
Input current needs to be around 5A or less for “optimal performance.”
If you are willing to give up a little Xtreme factor you could drive 3x6V MT-G2 at 2.5A from 3x18650 to stay below that 5A threshold. Input wattage will be roughly 51W with input current peaking at 5.6A when the cells are 3V.
Before making the investment, it might be a good idea to remove the BTU reflector and test it with a single mtg2 to verify that the design plays well with that emitter.
if not just drill it out and stipple the heck out of the reflector with clear coat - its going to be a flooder anyways right?
No! Stop that! J)
de-domed XPG2 left, S1100+MTG2 right:
...distance about 8 feet, outer spill is outside the frame but they're nearly exactly the same size on both lights. A photo in the same setting comparing the XPG2 to an actual flooder like an SRK would have the SRK's 'hotspot' covering the entire frame.
I’ve decided XM-L2 U2’s would be too easy. And since I’m a battery snob I only use Panasonic 3400 mah or CGR18650CH 2250mah, so no power issues there. Tail switch needs upgrading to 10 amps. I’m looking at a few 5-7 XM-L led drivers, I want 3 modes. It’s close on the reflector fit, could drill out just a tad, but never going to stipple the heck out of the reflector with clear coat. NEVER!! My other MT-G2’s are long range flooders as will this one be. And as always input is greatly appreciated.
i also vote for mt-g2. i actually wanted to do the same to a btu shocker. but didnt think it was possible. ill be keeping an eye on this thread…
I just can’t seem to wrap my brain around what driver using 3-18650’s to run 3-MT-G2’s will really work. I’m throwing in the towel and going with 3 Cree XM-L2 U3’s on copper pads. Now to find them. If anyone gets it, then go for it and show lots of pictures and specs.
3 MT-G2 in parallel, and a driver that can output a lot of current and take 3 cells, like this.