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Technology Stocks : Vanteck (vrb-cdnx, vttcf) -- Ignore unavailable to you. Want to Upgrade?

To: Larry S. who wrote (180)	2/1/2005 9:27:56 PM
From: gg cox	Read Replies (1) \| Respond to of 413

Question: Is an ultracapacitor better than a battery? Answer: An ultracapacitor is different than a battery, and depending on the application, may be a better solution. Often, a combination of the two is the best approach, combining the excellent power performance of the ultracapacitor with the greater energy storage of a battery. An ultracapacitor can be charged to any voltage within its voltage rating, and can be stored totally discharged. Proper system sizing includes accounting for a capacitor's voltage change as it is charged and discharged. A battery operates within a very narrow voltage range, determined by its chemical reactions, and can be permanently damaged if over-discharged. State of charge of an ultracapacitor is simply a function of voltage. State of charge of a battery involves multiple dynamic calculations. An ultracapacitor stores much more energy than a conventional capacitor of similar size. A battery will store much more energy than the same size ultracapacitor. In applications where power determines the size of the energy storage device, an ultracapacitor may be a better solution. The ultracapacitor is able to deliver frequent pulses of energy without any detrimental effects. Many batteries experience reduced life if exposed to frequent high power pulses. An ultracapacitor can be charged extremely quickly. Many batteries are damaged by fast charging. An ultracapacitor can be cycled hundreds of thousands of times. Batteries are capable of only a few hundred cycles. maxwell.com