batteries

	I have somewhat of a vested interest in knowing about batteries, since
I'm doing the electrical power subsystem development work for groundbreaking
work on Mars environment spacesuits with NASA 8-)

	The apollo suits used rechargable (but not recharged) batteries with
a power density of close to 200 watt-hours per kilo.  This corresponds very
well with the listed TL6 battery (exactly, as it happens 8-).  I don't know
about rob dean's Cr to $ conversion, I always used 1:1 myself for most things.

	Future developments are expected to give up to 6-900 watt-hrs per kilo
in the next 10-15 years.  The best ones we have now are about 400 watt-hours/kg.

	My guess is that the TL5-9 numbers are accurate.  Above that, I can't
hazard a guess.

	I agree that the listed control point values are out of control.  I
would suggest that a battery need only about 0.1 CP per ton, and that any req's
under 0.1 CP be ignored. 8-)

- - -george william herbert
[email removed]