When I read about the light systems some of us on the forum have I think I see some confustion. If someone here knows for sure please correct me! I know Volts X Amps = Watts. I went to Batteries Plus and they wrote down the formula for me so I could figure out what I wanted in a battery and runtime. Right now I have a 6V, 6W system. Following the formual I should draw 1Amp. Using a 5AHr battery, I should get 5 hrs runtime. Almost always a little less depending on how cold the weather is and how old the battery is. NMHi batteries may give better performance but with your basic halogen, I think the formula is fairly accurate. NMHi are a little pricy but those "in the know" say they are worth the money.

Occasionally I'll charge my battery to full and turn on my headlight for a timed test. Right now I get about 2.75-3Hrs out of my 5AmHr battery. It's getting old. Time to shop for another one. Hope this helps.