Battery at 4.3v

[Doc8404]

2013 F150.
Off brand battery (put in by Chevy dealer I bought it from years ago), well taken care of, 3/2018 date of battery. In service shortly after.

I unplugged the battery management system years ago and didn't realize that is what would shut off the battery if you did something stupid....like leaving the keys ON in the ignition all night like I did last night.

Multimeter said 4.3v.

Prologix battery charger at 10a got her up to 13.2.

Is this thing dead?
Play it by ear?
Replace now?

 

[dubber09]

Play it by ear, I'd sure charge it at slower rate thou, like 2A.

 

[Chris142]

Have it tested

 

[zzyzzx]

I've done worse and still been able to use the battery for years later.

My point being you never know unless you try. You have got nothing to lose by trying to manually charge the battery back up and seeing if it works.

 

[The Critic]

I did it twice to my Deka AGM and it was still fine at the 3.5 year mark. It was under 3v both times, too.

 

[brianl703]

Just remember that discharged batteries are more likely to have the electrolyte freeze in cold weather. If that happens they are junk.

 

[thastinger]

Luckily it didn't sit at that low state of charge long enough for the plates to start to sulfate(it seems due to taking a charge), but at 5 years old already, it has had a good life.
A hydrometer is really the only way to tell the health of a battery but a load test in the next best thing.

 

[Doc8404]

Just remember that discharged batteries are more likely to have the electrolyte freeze in cold weather. If that happens they are junk.

hard frost last night, in the 20sF

 

[Doc8404]

Luckily it didn't sit at that low state of charge long enough for the plates to start to sulfate(it seems due to taking a charge), but at 5 years old already, it has had a good life.
A hydrometer is really the only way to tell the health of a battery but a load test in the next best thing.

Forgot about my little ball floating hydrometer...

 

[Doc8404]

Forgot about my little ball floating hydrometer...

But it won’t work. It’s a sealed battery.