I first saw one at my local Ducati speed shop. The technology is really amazing and came from the defense industry I believe. I am not sure what a WR450F stock battery weighs, but these things are _really_ light. They are still quite expensive, but if it knocks off 5 lbs, I would definitely consider one. The one that I held was for a Ducati Superbike and would be an instant 7 lb savings over the stock battery. They have tons of cranking power, and are easier to maintain than a standard battery. No trickle charger needed, and they top off quickly. Here's one for a 750 anc lower application.