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Old 01-24-2017, 07:01 AM   #21
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Load test is pretty good for security, battery will fail that long before it quits on you to cause issues barring a VERY unusual situation.
Time to get out the load tester which I forgot I had!
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Old 01-24-2017, 09:59 AM   #22
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3 years and 122K still on the factory one.
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Old 01-24-2017, 10:07 PM   #23
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My failing battery would get to 14V very quickly while driving and drop to below 12V quite quick when parked and car off. It eventually died. New battery does not do this at all.
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Old 01-24-2017, 10:11 PM   #24
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My failing battery would get to 14V very quickly while driving and drop to below 12V quite quick when parked and car off. It eventually died. New battery does not do this at all.
the 14 down to 12 is called residual charge from the alternator. to get a true reading of a battery it has to sit for a few hours and i have a few batteries on my bench i could use to demonstrate with as they are all toast. (dont have enough to do a cashback on cores with the dealer i use)

i can run them on the charger for 8 hours they go up to about 12.8v an hour later its 12.1 but 4 hours later its down to about 10.3 (they are shot from being connected to a car that sat for 1 year+)
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Old 01-24-2017, 10:14 PM   #25
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the 14 down to 12 is called residual charge from the alternator. to get a true reading of a battery it has to sit for a few hours and i have a few batteries on my bench i could use to demonstrate with as they are all toast. (dont have enough to do a cashback on cores with the dealer i use)

i can run them on the charger for 8 hours they go up to about 12.8v an hour later its 12.1 but 4 hours later its down to about 10.3 (they are shot from being connected to a car that sat for 1 year+)
I know, it would drop to about 12.5V after shutting the car off, then from 12.5V to below 12V would happen in just a few minutes.
Turning on headlights would also cause the voltage to rapidly drop, not with the new battery though.
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Old 01-24-2017, 10:16 PM   #26
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yep sounds about right to a battery thats on its way out...
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Old 01-25-2017, 08:14 AM   #27
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Most talk so far is about gradual failure. I would think a battery that seems fine as far its voltages go, but suddenly lose a cell or something instant. Leaving you stranded.
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Old 01-25-2017, 09:22 AM   #28
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A battery is like a light bulb. It will eventually lose its luminescence and go out all of a sudden. I've had battery die on me before on my last car, and when my Focus started giving me messages about power saving mode on MFT right after I turned off the car. It was time to replace the battery. Sure enough, my CCA was lower than it should be for a normal battery. My OEM battery lasted 4 years and 69k miles. I'm running on a new Motorcraft Max 590 battery now.
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Old 01-25-2017, 11:57 AM   #29
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Quote:
Originally Posted by ArcticMynx View Post
the 14 down to 12 is called residual charge from the alternator. to get a true reading of a battery it has to sit for a few hours and i have a few batteries on my bench i could use to demonstrate with as they are all toast. (dont have enough to do a cashback on cores with the dealer i use)

i can run them on the charger for 8 hours they go up to about 12.8v an hour later its 12.1 but 4 hours later its down to about 10.3 (they are shot from being connected to a car that sat for 1 year+)
A load test would have even been much quicker than wait for the voltage to stabilise.

Sometime you have good voltage even with sulfation but when you put it under load voltage will drop quickly.
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Old 01-25-2017, 12:14 PM   #30
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i no longer have a portable hand tester the one i had was ancient it was a large red box and someone in the shop borrowed it and it never worked right after that so i pitched it... i forgot my charger on wheels had it built in.. my charger is usually parked just inside my garage on the right where i can run the wires outside my garage door direct to a battery still bolted into a car so i don't exactly keep watch except for the stat lights i forget the load test meter which is an analog sweep gauge and just go by what the lights spit out.. xD look in the side door.. batterys good, unclip and clip the leads to a plastic peg in the side of the outside door when im to lazy to open the door

and speaking of that i have a wagon in need of a charge as its alarm was chirping this morning and barely had power to unlock the doors
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Last edited by ArcticMynx; 01-25-2017 at 12:17 PM.
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