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Technology Stocks : VALENCE TECHNOLOGY (VLNC) -- Ignore unavailable to you. Want to Upgrade?

To: Pallisard who wrote (11936)	6/8/1999 2:32:00 AM
From: FMK	Respond to of 27311

Dell Battery comparison revised. Re: energy stored per 4x4 inch cell. I promised a reply to this post: exchange2000.com Micheal, Each Dell battery, as you described, holds 14.4 volts x 4.5 amps or 64.8 watt hours with a weight of 1.4 lbs each. As you say, two of them weighing a total of 2.8 lbs are required for 10 hours of portable run time. Starting with these numbers for Valence laptop cells: exchange2000.com I will use 20 watt hours for each 4x4 inch x 4 mm thick Valence cell as a likely present level of performance. A 40% improvement over the Hanil's 15.2 would be about 21.2. From specsheets, each cell weighs about 85 grams. There are 454 grams per pound. Two Dell batteries weigh 2.8 lb or 1271 grams. 1271/85 equals the weight of 15 Valence 4x4 inch cells . I believe a plastic enclosure might add 10% to the total weight. I will subtract 20% of the battery weight to be conservative, leaving 13 4x4 x 4mm Valence cells at 20 watt hours each totaling 260 watt hours. This is 260/130 or TWICE THE ENERGY STORED FOR THE SAME WEIGHT. The 10 hour run time could theoretically be extended to 20 hours by carrying the same weight of Valence batteries, or the second battery would not have to be purchased to achieve the same run time as the two 1.4 lb Dell batteries.