<<question for battery capacity of different kinds<< Since I needed some capacity indications myself, I have been searching the internet, and was quite surprised how difficult it is to find these data. What I found comes from a vendor of geigercounters: (I assume you have some knowlegde about currents, flows and resistors. I do, although I might misuse some words, trying to write English.) >>> We now have Alkaline batteries that have high current capacities in the 1 1/2 volt size. ( Duracell capacity ratings) AA Alk. 2850 MAH = Milliampere Hours. C Alk. 7800 MAH D Alk. 15,000 MAH To translate what this means, if you put a AA Alk. battery in a circuit that uses 40 milliamperes to operate, the battery will have a useful life of 71.25 hours. At the same rate (40 MA) a D size would run for 375 hours. <<< According to the Duracell site, the "Alkaline Ultra" or whatever they call it, has a capacity of about 1.5 times the normal alkaline version. As for other kinds of batteries, I have no data. As far as I know, the capacity of a battery does not depend on the usage. However, since a battery behaves as a resistor, the output voltage will drop when the used current rises. During the life of a battery, the voltage will drop from about 1.5 to 1.2 volts gradually. After that the voltage will drop fast. The hardware using the battery will decide for itself when it is time to shutdown: This may be at 1.3 volts in a camcorder (meaning the battery is depleted for only 2/3) or much lower in a flashlight that you will use until there is no light left at all. For things like photo cameras and GPS's I have no idea when they shutdown. I expect an electric pump to drain the batteries completely. Hope this is of some help, Niels Blaauw *************************************************************************** PaddleWise Paddling Mailing List - Any opinions or suggestions expressed here are solely those of the writer(s). You must assume the entire responsibility for reliance upon them. All postings copyright the author. Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************Received on Wed Mar 14 2001 - 05:32:33 PST
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