Posted by buickanddeere on February 10, 2012 at 22:13:44 from (216.183.156.246):
In Reply to: Re: O/T Electric cars posted by Tony in Mass. on February 10, 2012 at 19:59:32:
The Stationary storage cells we use for class one backup power last that long. They are just great hulking 660lb 2.2V lead acid battery cells. If you are talking about batteries for spacecraft that would be ni-cad cells or a variant. Or maybe lithium. Both handle deep cycling with less damage than lead acid. Part of the problem is these electric car mileage claims are with 100% charged batteries to completely discharged. #1 it uses a lot of power to and gases the batteries to get that last 10% charge. #2 Deep cycling the batteries reduce their capacity and service life. So if "Elecro-Zap" car company says 50 miles on a charge. it really means 20 miles in ideal circumstances and 10 miles in summer heat or winter cold. There is no secret Star Trek battery. The laws of physics make storage cells very heavy per KW rand/or very hot, very toxic, very expensive. Most people can't seem to understand it takes a 4000lb battery to propel a 3000lb car a useful distance. Problem is that car now weighs 3000+7000+ another 1000lb to car the extra weight. Most of the energy in the battery pack will be used just to haul the battery pack around.
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