Are you going to be running it purely off the battery and charging it at home, or are you going to be running it off the motor using the battery as a filter/emergency power source? If the former, you'll want to go with LED's, they'll help you get more time out of your lights unless you're only going to be doing short runs. If the latter, you'll want a rectifier to convert the motor energy to DC power, you could probably get away with a small battery pack from Radio Shack (or The Source) and using rechargable batteries.