With 8.5 volt r/c battery, i want one 3 volt light. What size resistor do i use and from where to get it? Answered

I tried hooking up the 8.5 volts direct of course it torched the light.  I want to wire this light, or perhaps two of them to the 8.5, 3300 mAmp battery from the picture, this battery is about as long as a smart phone say if that even matters.  Please someone can tell me, what resistor to use, where do i get it, and how do i hook it up?  Thanks for help