Reason why I swear by Lithium, I bought it for the Charity Premier way back in May. Had it on the whole gala premier (minus when watching the movie). Had it on the whole evening for May 18, Had it on the whole afternoon during our Parade down Orchard. And had it on the whole afternoon at the Tampines Library event. That's an estimated over 10 hrs batteries life. And trust me when I say this, it makes them sabers a lot brighter. I had the brightest saber on the Premier night amongst the other FX and the reason is 1. Luke ESB saber (which is tied for brightest with Anakin ROTS) and 2. LITHIUM!