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Article #14334Nicad battery "tester"(?) wanted
From: Jim Washer
Date: Wed, 19 Jun 1991 18:12
Date: Wed, 19 Jun 1991 18:12
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With all the discussion about nicads, nicad capacities, nicad memory, nicad charging techniques, nicad ......, I thought it might be nice to build a device that would give me some quantitative measure of a batteries capacity. I thought that building a circuit that would draw some fixed current, until the battery voltage dropped to some pre-selected value would suffice. An lm317 would work well to set up the constant current, with a little thought I (might)could develop the auto shutoff to avoid over-draining the battery and the timer circuit to record how long it held the voltage up. Does this sound like a reasonable idea? My plan is to 'test' new batteries when I purchase them, and then periodically test to see that they have not gone sour. Is drawing a constant current a reasonable test for a nicad? How much current? Comments? Flames? Circuits? tia - jim KG7HH 1-503-578-3171
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arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!mips!cs.uoregon.edu!ogicse!sequent!muncher.sequent.com!washerShow Full Headers
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!mips!cs.uoregon.edu!ogicse!sequent!muncher.sequent.com!washer From: washer@sequent.com (Jim Washer) Newsgroups: sci.electronics,rec.radio.amateur.misc Subject: Nicad battery "tester"(?) wanted Message-ID: <1991Jun19.181233.12893@sequent.com> Date: 19 Jun 91 18:12:33 GMT Sender: washer@sequent.com (Jim Washer) Organization: Sequent Computer Systems, Inc. Lines: 21