On Feb 22, 5:20*pm, harry wrote:
On Feb 22, 11:16*am, 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.

There is other technology on the horizon.

Been here for years.

http://en.wikipedia.org/wiki/Super_capacitor

Instant charging is possible.

No it isn't.

They are good as temporary storage for, e.g., regenerative braking,
but practically useless as primary storage.

higher charge/discharge rates are possible but energy density is much
lower.

MBQ