After years of searching for batteries small enough to fit inside a minifig scale Lightsaber hilt, I gave up. The world just doesn't have an industry standard commercially available battery small enough to fit in a 3mm space.
That's exactly why I paid mucho grande to have our manufacturer MAKE a battery that would fit! And the resulting LEDsaber you see before your very eyes is the first recipient of our new battery technology. No more wires! We've managed to squeeze 4 of these batteries in the hilt and have enough room for the LED and components for turning it on and off. To turn the LEDsaber on, simply insert the desired color saber blade into the end of the hilt!
More minifig scale utensils and weapons to follow using our new battery technology. Stay tuned!