Thanks Izan,
I bought two 900mAh protected batteries from the dropdown menu with the BB. They look to be Ultrafire.
As they are half the price of the AW protected (750mAh) and 2/3 the price of the AW IMR (600mAh), I am wondering if the mAh rating on those is the most pertinent point. I don't plan on running the BB outside of 3.7v (at 2.0-2.5 ohms, I'm guessing). Which of those batteries would be best for my use?
Whichever I use, if they need too frequent charging, I'll keep more than two in rotation.