AUX Battery Replacement Experience and FYI

[Gatorized]

I’m still running the original batteries on a 11/2019 build JT… always on a maintainer when it sits more than a couple days. But am getting intermittent start/stop failures that reset with engine restart. So just a matter of time and I will be replacing both. Pushing 6 years on the OEM batteries is a long time!

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[ShadowsPapa]

I’m still running the original batteries on a 11/2019 build JT… always on a maintainer when it sits more than a couple days. But am getting intermittent start/stop failures that reset with engine restart. So just a matter of time and I will be replacing both. Pushing 6 years on the OEM batteries is a long time!

Could be why I have few electrical bugs on Jeeps.....

 

[SimonH]

Did you at least CHECK the main battery, and charge both and reset the IBS in the process?

Well

I got the car with 24 km on the clock, but it was parked 2 years in a show room.

Batteries were dead, so dealer changed the starter battery (main) directly before handing over it to me.
Aux battery took 6 weeks to get in Germany, as it was warranty, it had to be an original mopar battery (at least from their service warehouse)....

then it was installed, and I think they reset what ever was needed.

 

[Great Offender]

Bought used in 23 with 27K miles and the ESS never worked so I brought it to the dealer. After several trips they replaced the aux battery but it still never worked. I don't drive it much so I keep it on a tender when I remember. Fast forward, dead battery, and I decided to replace everything. Found that my dealer had broken something when changing the aux which led me to removing it from the bottom. Still rarely drive it and I have added an exterior Noco plug which now lets me plug it in easily. AC is always on because = South TX and trips are 2 miles or less, charges at 14.1 V, and the ESS works 2 or 3 times until it quits. I work from home so I just don't drive it enough and I quit worrying. Got almost 4 years out of the main.

 

[Sandman 4x4]

I'm more of a "leave, but pay attention" person. I watch battery voltage (checking while driving, and if it sits, I check voltage now and then to see if they need topped off with a BatteryMinder)



Now you are complicating things - and really done if one battery craps out - totally done. If one of the 12s goes to heck, you are normally still fine.
But batteries in series are another animal.

If I were doing anything - I'd simply get the largest capacity 112v batteries I could fit into the physical space.

Even tractors use multiple 12v batteries, not multiple 6 volt batteries.

That’s a good point if one dies. But trailer tractors have used multiple 6v in series on one side, then parallel for 12v. Just to get all the amps possible, ever see a starter used to start a 900 ci diesel with 18:1 compression?

 

[ShadowsPapa]

That’s a good point if one dies. But trailer tractors have used multiple 6v in series on one side, then parallel for 12v. Just to get all the amps possible, ever see a starter used to start a 900 ci diesel with 18:1 compression?

My tractors were a mix of Case and IH............. and I worked on customer tractors in my shop, Massy-Ferguson, JD, Case, IH and so on.

There was a funny episode of IRT where they couldn't get something started, and pulled a battery out, and held it upside-down over the battery terminals of the other equipment to get it started. I thought - you are CRAZY - but it worked.
Generally what they showed were all 12v arrays there.

 

[Rglideride]

Well, well we'll. I purchased a 2022 Sahara with 41k miles on the odor, 30 days ago. The auto start stop Never has worked. I ASSUMED the previous owner had bypassed the system (which I actually appreciated) so I didn't question it. This morning, after 2k trouble free miles, our Gladiator wouldn't start. Thanks to the forum, and participants comments, I have a place to "start"!

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