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battery question

J

jddrawbar

Well-known Member
Just bought a new battery (WalMart, Johnson controls). Got home and put it on my digital charger & it was @ 90%. Charged it up, and came back in a couple hrs. & it was back to 90%. I've done this several times and the same thing. Let it set over night and it was at 85%. I don't think a battery should discharge that quick......would like to hear some comments. Thanks for your input.
 
(quoted from post at 20:10:33 07/24/19) Just bought a new battery (WalMart, Johnson controls). Got home and put it on my digital charger & it was @ 90%. Charged it up, and came back in a couple hrs. & it was back to 90%. I've done this several times and the same thing. Let it set over night and it was at 85%. I don't think a battery should discharge that quick......would like to hear some comments. Thanks for your input.
Click to expand...

Install the battery and give it a try, while it certainly may be "bad" I wouldn't put ANY faith in the digital readings of a "consumer grade" battery charger.
 
KELLO jddrawbar,


Those readings are meaningless! Check the voltage while the battery is on charge, then 15 minutes after the battery comes off the charger.

Voltage should be 12.6 volts @ 80 degrees F. Sounds more like the charger is not charging the battery, then a battery issue. The battery should have the same voltage the next day.

Also make sure the battery does not have leaking voltage on the top. Take a voltmeter and check that too.

Guido.
 
12.5V is 90%
12.1V is 50%
11.7V is 25%

What voltage did you read before/after? If you tested the battery right after charging, did you remove the surface charge, or what was the voltage right before you tested?
 
I in the past buy a new battery and find that is is junk from the get go. Last one i did that with was from Wal-Mart. I took it back and got another one that was good but I made them check i before I left the store
 
Did you check the date on battery? You could have bought an old new battery.
Can you trust your test equipment?
There is no one test that can confirm if a battery is good or bad.
Best test is when battery fails to start your car.
 
As far as using battery voltage as a measure of its State of Charge (SOC) it can indeed provide some indication HOWEVER it must be taken when the battery is at rest and stabilized NOT just off a charger or under a load...??.. When I want to determine battery condition I use THREE INDICATORS. 1) Volt Meter 2) Hydrometer 3) Load Tester. If any doubt Id return it before even installing. Is the electrolyte level correct ????

John T
 
It is not unheard of to get a battery that drains itself. Used to work with a guy that had 2 MG cars. 1 was always going dead ? could not find anything wrong ? Switched battery to other car and problem went with the battery.
 
(quoted from post at 20:10:33 07/24/19) Just bought a new battery (WalMart, Johnson controls). Got home and put it on my digital charger & it was @ 90%. Charged it up, and came back in a couple hrs. & it was back to 90%. I've done this several times and the same thing. Let it set over night and it was at 85%. I don't think a battery should discharge that quick......would like to hear some comments. Thanks for your input.
Click to expand...

Bought a pair of 4D batteries from a dealership for my loader in November.

Put them in, fired it up, tested it and parked it.

1 week later went to use it, no start.

Hooked up 24 volt charger for a few hours, good to go.

1 week later tried it again, no start.

Fully charged each battery separately on a 12 volt charger and let them sit completely disconnected.

One of them held the charge just fine.

The other one would seem fine for a day or two but by day seven it would be down to 8 volts.

So yes it can happen with a brand new battery, I exchanged it for another and it has been fine since.
 
Thanks for the replies.....manufacture date on the battery is 6/19. My charger is a high end
& just a couple yrs. old, but it is digital, so you know how that is. Just checked the
voltage & @ 90% it was 11.5.....charged it to 100% & it was still @ 11.5. I think it needs
to go back. Appreciate the help
 
4play,
When in college I would co-op at Crane Naval in the calibration department. Every piece of electronic
equipment on the base had to be tested on a regular bases.

How can anyone have faith in their voltmeters if they haven't been calibrated?
 
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