AW's are good and I have some but for most mods I don't think they're worth
2x what a 'flame' TrustFire costs. The AW 750mah Black & Chrome batts will work fine in ur mod. The 900mah Trustfires are really closer to 700~725mah when tested. The UltraFires are probably closer to 680mah based on the run charts on the flashlight forums. The mah is just how long it'll run and his little other effect on a regulated 2 battery VV or 5v mod.
In a mod that uses 2 batteries the voltage is being regulated DOWN so the current draw isn't enough to require IMR type or unprotected batteries. You're not likely to draw over 2.25A which the protected TrustFire Flames will do as will the Black/Chrome 750mah AW protecteds.
This is
not the case in single battery VV mods where a 'booster' circuit is being used.
U can get the AW 750mah batts
HERE but for less then half the cost I'd get these
HERE
Shop around a bit and u can probably get a better price on the AWs though. You can get the TrustFires real cheap out of China if u order a min of 6 or 10 and can wait 6 weeks and are willing to roll the dice on what u really get.
The TrustFires u linked to are NOT protected batteries. I really think you'd be better off sticking with the protected versions in 'blue' or 'flame' packaging. Make sure it says "protected" or "with PCB".
I keep extra TrustFires Flames around and let 'em out at $7/pair but doesn't look like u r in this neck of the woods ;-)
Skip
PS: My 'flames' and 'Blck/Chromes' all measure ~51mm. Fit all my box mods.