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Article #4860Re: NiCad "Deep Discharger"
From: Bob Parnass, AJ9S
Date: Wed, 27 Jun 1990 12:24
Date: Wed, 27 Jun 1990 12:24
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In article <1990Jun26.194638.12467@vicorp.com>, ron@vicorp.com (Ron Peterson) writes: > What is the shelf life of a nicad battery? > Are there any ways to improve it? (Store > in refridgerator, store charged/discharged, > store it in helium, store in a vacuum, ???) No NiCd battery is perfect -- all have a finite shelf life. NiCd batteries will discharge by themselves, through spontaneous chemical decomposition, even when not connected to a load. The General Electric Company indicates that the average NiCd will lose about 1% of its capacity per day at 70 degrees F. Average self discharge at 100 degrees is about double (2% per day) the discharge at 70 degrees, which is a good reason to avoid storing NiCd batteries in a warm automobile. -- ============================================================================ Bob Parnass, AJ9S - AT&T Bell Laboratories - att!ihuxz!parnass (708)979-5414
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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!samsung!sdd.hp.com!elroy.jpl.nasa.gov!usc!zaphod.mps.ohio-state.edu!mips!pacbell.com!pacbell!att!cbnewse!parnass From: parnass@cbnewse.att.com (Bob Parnass, AJ9S) Newsgroups: sci.electronics Subject: Re: NiCad "Deep Discharger" Summary: NiCds lose about 1% charge per day at 70 degrees F Keywords: NiCad Discharge Memory Message-ID: <1990Jun27.122406.26912@cbnewse.att.com> Date: 27 Jun 90 12:24:06 GMT References: <1990Jun15.154259.2666@ux1.cso.uiuc.edu> <9634@pt.cs.cmu.edu> <1990Jun26.194638.12467@vicorp.com> Organization: AT&T Bell Laboratories, Naperville, IL Lines: 20