Lithium vs Lead (was: Battery prices)

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Lithium vs Lead (was: Battery prices)

Jeff Shanab
On the subject of calender and cycle life.
A recent "state of lithum batteries" study for nasa has achieved 18000
and 22000 cycles maintaining 925 efficiency by reducing the charging
voltage on lifepo4 from 4.2V to 3.9V. This was on a 5 year and on a 7
year study.

http://www.batteriesdigest.com/state_of_lithium_ion.htm

Low earth orbit satellites have to run off battery every 90 minutes as
they move into the shadow of the earth.

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