I recently ordered the Ultrafire WF 501b flashglight but have yet to order a 18650 battery for it. I was wondering what people would recommend for a battery type?
Those would probably work but I would recommend getting some name brand cells which will give you much longer run times. Those have a real capacity anywhere from 1 mah to 2400 mah, however with name brand cells you know exactly what you're getting.
I would suggest buying either Sanyo or Panasonic cells with protection circuit. For example XTAR 2600 or 3100mAh 18700. They are a bit pricier, but much better and safer.