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Technology Stocks : Energy Conversion Devices -- Ignore unavailable to you. Want to Upgrade?

To: see clearly now who wrote (3224)	2/19/1999 5:08:00 PM
From: Ray	Respond to of 8393

Thanks, Anold, for the reference. However, it does have some of the flaws I mentioned. For one thing, I believe the chart is about a year old - at least I first saw it about a year ago and it looks the same as I remember it. Perhaps it has been newly edited and available elsewhere (it was being developed for class notes, I believe), but there are some numbers that are wrong. The energy density for advanced lead acid batteries is about 45 Wh/kg or more - according to mfgrs such as Electrosource (ELSI). Both NiCAd and NiMH now have higher energy densities (I think the ratio between them has stayed about the same, though). NiMH batteries for power tools cost only about 50%more than NiCAds, which is much different than the chart says (B&D sells both types for their new plug-in-battery tools, and the price differential is 50%). The stated cycle life given for NiCads seems to be a bad joke - under lab conditions, maybe, but few people get anything like this cycle life. Lithium Polymer batteries are now in production. There may well be other flaws in the chart, but I think I have made my point: reliable, up-to-date information on batteries is hard to come by. Don't give up looking for data - this task takes the efforts of us all. Ray