Don't have one but folks at mtbr.com says it works well, plus all the chinese dual xm-l 1000 lumen lights are $40 now.

http://www.fasttech.com/products/0/1...00-lumen-led-b

These are $50 but the housing quality is superb.
http://www.fasttech.com/products/160...00-lumen-white
http://www.fasttech.com/products/160...00-lumen-white

I don't use battery lights, I use dynamo lights (definitely not the route you want to go if you insist on keeping the cost down, a dynamo setup is minimum $150 to start (and nowhere as bright as that $40 light)).