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Article #371Re: Draining / Discharging a Ni-Cad 10V Battery
From: Michael Covington
Date: Mon, 02 Nov 1992 16:18
Date: Mon, 02 Nov 1992 16:18
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In article <1992Oct30.193947.16978@sco.COM> abhinava@sco.COM (Abhinav Aggarwal) writes: >I have a rechargeable Ni-Cad battery. I would like to drain it >to about 1-2 V (from 10V ) before I recharge it. Please don't. A battery is a set of cells in series (presumably 8, in your case). If you drain below 1 volt per cell, the weaker cells are likely to suffer reversal and be damaged. Drain to 8 volts and then stop. >I plan to use a 500K ohm resistor to discharge a battery. That will be very slow! Using Ohm's law, you'll be drawing 10/500000 = 0.00002 ampere (i.e., 0.00002 amp-hour per hour). If your battery's capacity is something like 1 amp-hour, then a full discharge would take 50,000 hours! Use a 12-volt, half-amp light bulb, maybe. -- :- Michael A. Covington internet mcovingt@uga.cc.uga.edu :- Artificial Intelligence Programs phone 706 542-0359 :- The University of Georgia fax 706 542-0349 :- Athens, Georgia 30602 U.S.A. amateur radio N4TMI
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Path: arc1-ca.pugleaf.net!sparky!uunet!ogicse!emory!athena.cs.uga.edu!aisun3.ai.uga.edu!mcovingt From: mcovingt@aisun3.ai.uga.edu (Michael Covington) Newsgroups: sci.electronics Subject: Re: Draining / Discharging a Ni-Cad 10V Battery Message-ID: <1992Nov2.161827.2992@athena.cs.uga.edu> Date: 2 Nov 92 16:18:27 GMT Article-I.D.: athena.1992Nov2.161827.2992 References: <1992Oct30.193947.16978@sco.COM> Sender: news@athena.cs.uga.edu Organization: AI Programs, University of Georgia, Athens Lines: 25