I'm not saying everyone's aux doesn't go bad but I also know people that have over 100,000 on theirs. Those aux batteries are made to go a while but I don't blame you for replacing it either.
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I heard FCA is looking for engineers. If deleting the battery is such a perfect solution then I'd expect there to be one battery from the time I purchased mine. Batteries vary in life expectancy. So one person's experience can't be compared to another's. It's just how it is but I can promise you deleting the battery isn't the solution but if you're good with it then I'm good with it but not on my Jeep.I have 2 - 2020 Jeeps. One caused me a lot of grief because of battery issues (primarily because the techs at the dealership do not understand the system). The other has been trouble free.
The Jeep system works great as long as the batteries are good. It's only when age and/or usage patterns take effect that the system shows it's flaws. The saving grace of the system is that it starts sending messages when trouble is near. The messages are varied. I don't know why. Things like "Stop/Start not working - Battery charging" are common. Another one is "Aux switches not working." The Jeep dash voltmeter will tell you if your charging system is working (14+v when running - some exceptions). It's difficult to use the voltmeter to determine which battery is bad. You can see voltage under load for both batteries if you put your ignition in "Run" with the engine off. You can see the loaded voltage of the aux battery on the dash voltmeter during a Stop/Start event. You could even disconnect the aux battery negative and see voltage under load of the main battery. Making decisions on when to replace the batteries is awkward because Jeep's parameters for the system cause generation of trouble clues at battery voltages that would normally be considered good (~12.4v).
On my Jeep that had battery trouble, it took 4 visits to the dealer and an phone call with the dealership General manager to get 2 new batteries (warranty work). I'm driving it now with the 2 new Mopar batteries
On my Jeep that has been trouble free, I started getting the low battery clues after my warranty ran out. I could have nursed it along for several more months. Instead, I removed the aux battery, pulled fuse F42, and installed a single high quality group 94 battery. The new battery has virtually the same power as the combined 2 original Mopar batteries. The new battery also came with a 4 Year warranty (vs. 3 for Mopar). My jeep works exactly like it did when it had 2 batteries.
I laughed when I saw this thread and initial content of it. It reminds me of the stories we hear from in today's political news. To support my statement, I submitt that Jeep Forums are the only forums where I see sections dedicated to battery problems. I point out that many manfacturers utilize a stop/start system with just one battery. I offer my own personal experience to valadiate the "hard to diaganose" complaint regarding the battery system. Your opinion may vary.
Peace of mind at last! Replaced main battery with a premium H7/Group 94 battery | Jeep Gladiator (JT) News, Forum, Community - JeepGladiatorForum.com
A Christmas message about Jeep's batteries and charging system. | Jeep Gladiator (JT) News, Forum, Community - JeepGladiatorForum.com
'21 Mojave with almost 60k on it and I have had zero battery issues and I have a Warn Zeon10 and auxiliary lights which I run a lot and an ARB Zero fridge which is on all the time. I also have a Tazer Mini and the auto stop/start is disabled.
19,000 on 2023 JTR and no issues. Start stop turned off.
40k miles ,70k miles ,3500 miles and 36k miles 3 Jt's and a Jl zero issues. All winched up and 3 with full 8 kc light bars 2 fridges in the bed. So far so good ??
