Check this out Goombas ... http://www.activepower.com/ ... as we all know, you pick up a 1950 text book and you can find all there is to know about valve regulated and flooded batteries ... they require constant attention, testing, and maintenance, and they are about as environmentally freindy as nuclear waste ... enter the FLYWHEEL ... we have one of these working in a Philadelphia hospital ... nice ... a flywheel of substansial mass spins in a vacuum chamber filled with oil reducing friction ... NASA uses these to store the energy from orbiting satellites solar panels ... here on Earth just change the oil and filter for maintenance ... I see a definite future for these puppies! ... Ride Free ... -Papa Joe