I have a light that I put together from parts from you.

Here is what I have

SF 9p. With extension. =12v. Of cr123

Turbo head

Here is what I would like to do.  

Convert existing light to 18650 or use turbo head with 18-650 body.  

It will be a weapon mounted light that I use to coyote hunt.  I am tired of buying cr123s and would like to go rechargeable.  
My current light gives me 100-125 yards of visibility with a clear ID on a y
Coyote.  

I also realize this is probably old technology and I might can get better performance out of something new.  I would like to use the 18650 batteries or other high capacity rechargeable.  

What do you recommend?  I am willing to spend up to $150.

Without boring the 9P body you'd need to go to two 17500's... but the bigger problem is finding a turbohead conversion that's affordable.  IF you can afford to make a change I'd highly recommend the OLight M2X-UT Javelot (incredible throw & accepts 18650's) or you could go to a Surefire P2X Tactical or Defender and use a 17670 battery stick.  I'd also recommend the Elzetta Bravo and use the 17670 or the Charlie and use two 17500's.

Thanks,
Kevin