"Stephen Haley" wrote in message
...
I thought that some LIon are actually quite good at high current draw
applications. They are certainly making inroads into the model plane
market
now their price is dropping. The main problem with them is their
pontential
to explode if shorted out through thermal runaway and they require
specialised charging requirements. A secondary problem is that you cannot
measure the battery state through voltage.
The main advantages of lion are the light weight per amphour BUT they are
bulkier than lead acid by about a factor of 2.

The other advantage is that they work much better at low temperatures --
which is significant if you're flying in, say, wave.

snippage

Tim Ward