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11-18-2010, 06:42 PM
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Join Date: Jan 2005
Location: SoCal
Posts: 2,061
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A (dumb?) Question About Batteries
Is it possible for a battery to fail in such a way that it puts out only 7 volts, but still cranks the motor very well?
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Steve Zicree
Fullerton, Ca. w/beautiful 2.5 year old son 
RV-4 99% built  and sold 
Rag and tube project well under way
paid =VAF= dues through June 2013
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11-18-2010, 08:27 PM
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Join Date: Dec 2009
Location: Bismarck, ND
Posts: 212
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battery voltage
Is the 7 volts before or during cranking?
If it was before cranking, I would suspect a problem in the voltage measurement since 7volts would be quite dead.
If you are measuring 7 volts during cranking, I would not get overly concerned.
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Larry Buller
RV7A slow build, Tip up, IO360 200hp, Catto 3 blade, Dynon Skyview, arinc 429, ems, SV transponder, Garmin GNS430w, Aera 560, Dynon D6.
FLYING!
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11-18-2010, 09:00 PM
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Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,120
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If you're measuring 7 volts BEFORE cranking, and your engine still cranks normally, your voltage meter is shot and the battery is fine. 7 volts during cranking would not be too much out of normal.
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Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2020 dues paid
N16GN flying 700 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, 430W
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now. 
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11-18-2010, 09:03 PM
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Join Date: Jan 2005
Location: SoCal
Posts: 2,061
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It was before cranking. I think I've got a bad meter. Thanks.
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Steve Zicree
Fullerton, Ca. w/beautiful 2.5 year old son
RV-4 99% built and sold
Rag and tube project well under way
paid =VAF= dues through June 2013
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11-19-2010, 06:28 AM
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Super Moderator
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Join Date: May 2005
Location: Locust Grove, GA
Posts: 2,624
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Yes, you probably have a bad meter, BUT 7 volts during cranking is not right either. A good battery should only drop to 9.3-9.6 volts during cranking.
Vic
__________________
 Vic Syracuse
Built RV-4, RV-6, 2-RV-10's, RV-7A, RV-8, Prescott Pusher, Kitfox Model II, Kitfox Speedster, Kitfox 7 Super Sport, Just Superstol, DAR, A&P/IA, EAA Tech Counselor/Flight Advisor, CFII-ASMEL/ASES
Kitplanes "Unairworthy" monthly feature
EAA Sport Aviation "Checkpoints" column
EAA Homebuilt Council Chair/member EAA BOD
Author "Pre-Buy Guide for Amateur-Built Aircraft"
www.Baselegaviation.com
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