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Old 01-24-2015, 03:04 PM   #1
Supramk3
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Battery dying!! Help!!

Okay so my 2012 Focus S. Has just a tad over 42k on the odometer. This winter I've noticed something quite annoying. We have a jeep that's just easier to drive in the winter so we drive it occasionally. So the focus sits for 2-3days at time. Well in that time the battery goes dead. And I have to jump start it. I have no extra accessories other than what came factory on it.

Is it quite possible I'm already due for a new battery? I first thought it had to do with the cold snap we had right after Christmas. But its still doing it and it's been 30-40* for weeks.

Any thoughts, thanks. Just hoping I'm not missing some sort of TSB or what not.


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Old 01-24-2015, 04:22 PM   #2
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You're not under warranty by chance are you? Probably a bad cell in the battery. I had that happen to a Mustang GT and the dealer replaced it under warranty.
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Old 01-24-2015, 06:15 PM   #3
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36k bumper to bumper and 60k drivetrain.
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Old 01-25-2015, 05:03 PM   #4
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The battery should be covered under bumper to bumper. If you are familiar with batteries and how to inspect them, I would suggest checking fluid level in the battery before hand, so that it is not dismissed as "warranty voided due to neglect."
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Old 01-25-2015, 07:23 PM   #5
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Really can't guess without testing.

Some batteries gave up early, some may not be quite as good at 3 years old - some cars have had more static drain than normal.

Easiest to get the battery checked first after charging it up to see if that's the problem.

Assume it's clean & dry with terminals in good condition.
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Old 01-25-2015, 08:54 PM   #6
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How dead is dead?

My battery voltage (after the car has been off and resting for a few hours/days) has been ~11.7V for well over a year (the first time I checked it). It hasn't given me a single problem starting.

Should I replace the battery anyway? I wasn't planning on it, but I guess it could be causing some wear on my alternator or something.

EDIT: That's via the dash TEST MODE menu - so maybe it's just not that accurate? I haven't checked it with a multimeter yet. Obviously, that's something I'll do before shelling out the money for a new battery that might not be necessary.
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Old 01-25-2015, 09:11 PM   #7
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It needs to maintain over 9.6 v while cranking, if it can do that it'll work OK.

(3 second full load standard, normal cranking requires less output)
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Old 01-25-2015, 09:11 PM   #8
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Quote:
Originally Posted by PratoN View Post
My battery voltage (after the car has been off and resting for a few hours/days) has been ~11.7V for well over a year (the first time I checked it). It hasn't given me a single problem starting.

Should I replace the battery anyway? I wasn't planning on it, but I guess it could be causing some wear on my alternator or something.

EDIT: That's via the dash TEST MODE menu - so maybe it's just not that accurate? I haven't checked it with a multimeter yet. Obviously, that's something I'll do before shelling out the money for a new battery that might not be necessary.
It's not accurate as it's about 1v less than actual, I've had the battery in the ST reading around 11.7 or so in test mode but when I hooked up a multi meter and probed the terminals it came back as 12.7+V. Obviously it puts a load on the battery to run the car with the engine off to take the reading but 1.0 V exactly idk.
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Old 01-25-2015, 09:24 PM   #9
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Quote:
Originally Posted by suss6052 View Post
It's not accurate as it's about 1v less than actual, I've had the battery in the ST reading around 11.7 or so in test mode but when I hooked up a multi meter and probed the terminals it came back as 12.7+V. Obviously it puts a load on the battery to run the car with the engine off to take the reading but 1.0 V exactly idk.
Thanks for the info!

I'll have to check the battery with a multimeter to compare (which also has its own range of accuracy). I'll disconnect the terminals to rule out anything that might be using voltage (the screens, parking lights, modules, etc.)
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Old 01-25-2015, 09:25 PM   #10
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Ah, the rest of the story.

suss got it, standard numbers are as measured directly at the battery.
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