Can it charge while its dropping the weight?
Check out the Bloombox, it's one hell of a battery. It uses fuel and oxygen but doesn't burn the fuel. It's much smaller than one might even imagine. It can be operated with methane from garbage dumps and adapted to solar power.
http://www.cbsnews.com/stories/2010/02/18/60minutes/main6221135.shtml
let's see here..bio-diesle..no thank's..to dirty...ethonol..lol what a joke..yeah..put it in you ride if you want to start walking soon...bad nasty shit..kill's your engine..it spew's just as much pollution as anything...even bio-diesle...and to make it? not even going to get started..lol...Wait! what's that? natty gas? wow! will car's run on it? hell yes! better than all above....how much do we have? more than you will ever know......ok...for house's..what's wrong with wind power? nothing! it's awsome! coal? nothing it's awsome! we have a shit load..more then you know...solar power? fuckin A! just look at Mojave, CA...hell they have been doing it out there for 20 year's! And out west...Thermal well's! hel when i was out there..(sadly most of my life lol) that's what i did..thermal well's..with golden state drilling (and for LEO trying to figure out who i am? good luck..it's been awhile lol)...I mean come on folk's..there's so many different way's of energy it's not even funny..Way's we can do it without forcing north american farmer's and land owner's to grow corn and other grain's for bunk ass fuel...we need that shit to FEED OUR FOOD! lol...damnit...i forgot about nuclear power..bout as clean as it get's...Please dont bash on me...I THINK i still have a opinion...and what i stated are fact's...i work for the largest tech company in the world..i'm on the oilfield service side of said company...guess who made your credit card's? lol yeah...a freaking french company..that started in the oilfield! with just two brother's...now they are the world's tech leader! guess who's dumping more cash into ALT. energy? well, beside's some of those smaller energy company's that people seem to think are giant's...i.e cev, tex. shell...yeah...there in the top 15..but there not THE big dog's...anyway..there's a shit load of work being done on it...now..if we could get a certain gubment party to play along..we can get some where...and fast! that 10 year thing is a fucking JOKE....PEOPLE! PUT PREASURE ON YOUR LEADER'S.