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Battery charged, but flat after several days?
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peterharvey
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Apr 15, 2012, 1:19 AM
Post #1 of 10
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Battery charged, but flat after several days?
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I have a 4 year old 550 CCA 12 volt Calcium maintenance free battery.
I used a special power point 12V Calcium mode battery charger to rejuvinate the battery [tooks 24 hours], then recharge the battery at 12 amps [took over half a day].
When full, the wall charger is disconnected.
With a Fluke 87V multi-meter, the battery reads 12.5 volts.
So I put it back into the 1994 Accord VTi, and the motor starts beautifully!
However, only a few days later, or a week later, having not used the Accord for a few days etc, the battery is flat again, and the motor won't start; in such a short period of time.
I thought the battery had to be below 9.6 volts to indicate that it is no longer rechargeable, and must be disposed of???
(This post was edited by peterharvey on Apr 15, 2012, 1:31 AM)
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peterharvey
New User
Apr 15, 2012, 3:29 PM
Post #3 of 10
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Re: Battery charged, but flat after several days?
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Thank you very much for your reply Hammer Time.
We can buy special electrical meters to test if the battery is flat, or must be disposed of.
These devices are really multi-meters that measure voltage.
Apparently, if the voltage is below 9.6, it is no longer rechargeable, and must be disposed of. Is that correct?
If the battery is okay, it should be about 12.5 volts.
If the engine is idling, the battery should register about 14 odd volts, to indicate that the alternator is recharging the battery.
If the engine is idling, and the voltage is still only 12.5 volts, then that means that the alternator recharging the battery is faulty.
However, does anyone know if 9.6 volts means that the battery cannot be recharged, and must be replaced???
My strange situation is that I used an electronic recharger to charge it to 12.5 volts.
It did remain at 12 odd volts for several days.
However, several days later, it went flat again, despite no usage.
Normally, a car 12 volt lead acid battery, must be left unused for months, before it gets flat. Know what I mean?
Does anyone know what's happening???
(This post was edited by peterharvey on Apr 15, 2012, 3:39 PM)
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Hammer Time
Ultimate Carjunky
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Apr 15, 2012, 3:40 PM
Post #4 of 10
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Re: Battery charged, but flat after several days?
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The one thing I know is that you are just full of wrong information.
I don't even know where to start with correcting your misinformation.
- The battery voltage reading has no bearing at all on whether that battery can be brought back or not.
- Modern battery testers are not just multimeters. A quality battery tester measures battery conductance.
As I stated before, you need to have the battery charged and tested before going any further.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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peterharvey
New User
Apr 15, 2012, 4:32 PM
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Re: Battery charged, but flat after several days?
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Thanks again Hammer Time, especially for that bit on conductance.
I will have to research further on this conductance.
My multimeter does measure conductance too.
Do give me links to any good battery testing education sites that you know of.
Thanks again...
(This post was edited by peterharvey on Apr 15, 2012, 4:34 PM)
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Hammer Time
Ultimate Carjunky
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Apr 15, 2012, 4:35 PM
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Re: Battery charged, but flat after several days?
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As a rule we don't post links here but here is a starting place.
http://eepowersolutions.com/library/industry-documents/impedance-and-conductance-testing/
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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nickwarner
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Apr 15, 2012, 6:35 PM
Post #7 of 10
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Re: Battery charged, but flat after several days?
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The 9.6 volts you are talking about isn't static voltage. To load test a battery with a carbon pile load tester you start with a battery at 12.6 volts, a full charge. You apply a load equal to half the CCA rating of the battery for 15 seconds. In the case of a 550CCA battery that would be 275 amps. If the voltage drops below 9.6 volts at anytime of the load test the battery is junk. Forget the multimeter. True power testing is with carbon pile. Its the only put up or shut up test to see what it can truly deliver.
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Hammer Time
Ultimate Carjunky
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Apr 15, 2012, 6:40 PM
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Re: Battery charged, but flat after several days?
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Pile testing a battery is still done somewhat but most shops are dropping it for conductance. It's less dangerous and actually more accurate and the battery doesn't have to be fully charged to test it. What you really don't want to do is test a charging system with one of those load testers any more. The new, high output alternators can't handle the sudden, extreme load.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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nickwarner
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Apr 15, 2012, 6:45 PM
Post #9 of 10
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Re: Battery charged, but flat after several days?
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Thanks for the clarification on that. I work on diesel trucks mostly and group 31 batteries.
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peterharvey
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Apr 15, 2012, 8:02 PM
Post #10 of 10
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Re: Battery charged, but flat after several days?
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Thanks very much for all of that guys...
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