On Thursday, September 13, 2012 10:43:29 AM UTC-4, Wayne. B wrote:
On Thu, 13 Sep 2012 08:45:30 -0400, BAR wrote:



What advances in batteries have we made in the last 100 years?



You put energy in and you take energy out.



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That's what batteries do of course - store energy for use at a later

time. How do you propose to advance that?



Energy stored per pound has advanced a lot. If you don't believe
that, take a look at the latest generation of cordless tools or laptop
computers.

I fly R/C. The advances in batteries (Li-Po and Li-Ion), and in the electric motors and their controllers, have enabled electric airplanes to be competetive performance-wise with their glow fuel powered counterparts.

The downside is the need to re-charge after every flight, and the cost. You can buy a glow motor and a lot of fuel for the cost of a motor, controller, batteries, and special charger.