Here is a 2AA/AAA boost driver w/ contact plate
http://www.fasttech.com/products/0/10002000/1143101-1-2-aa-aaa-1-18650-1-mode-1a-led-flashlight
output current is limited to 1000mA however
As others have said HKJ did a review of one (I believe from banggood) that might be better
No here it is Test/Review of 1~2* AA/AAA 5-Mode 800mA Linear Booster LED Flashlight Driver Circuit
http://www.fasttech.com/products/1612/10001750/1127407-12-aaaaa-5-mode-800ma-linear-booster-led-flashligh
Not the best output…but will run a XR-E or XP-G at fairly decent currents