Lee wrote:
On 22/02/2012 09:42, tony sayer wrote:

But there are still serious problems with implementing these the main
one is the primary power system. Batteries, unless someone does invent
one that is neigh on 100% efficient and has much greater capacity and
costs and weighs sod all, will always be their great limitation.

There is another problem here, namely that if a much higher density
portable energy solution was developed it would have too much potential to be "unsafe".
Whether deliberately or not.

Balderdash. Such higher density portable energy solutions blecch - you
know someone is bull****ting as soon as the say "solution" already exist.
They are smaller, lighter, cheaper and safer than giant LiIon batteries.

They can also be recharged within a few minutes.