But the 3400mah are different from the 3500mah, whether made by Panasonic or Sanyo, relabeled or not. It may seem like a trivial difference in capacity, but the 3500 can deliver higher current. For our use in bike lights the difference may not matter. For use in cars or airplanes it is a very big difference. That said, I perceive a brighter light with the 3500 Orbtronics, but I'm not comparing it to a 3400 Panasonic, but to the cheap Ultrafire batteries that came with the light. I'm assuming they'll last longer just based on the mah rating unless they draw more current to get a brighter light as I pointed out above.