ShadowsPapa
Well-Known Member
- First Name
- Bill
- Joined
- Oct 12, 2019
- Threads
- 247
- Messages
- 40,442
- Reaction score
- 53,860
- Location
- Runnells, Iowa
- Vehicle(s)
- '25 JTMX, '23 JLU 4xe, '82 SX4, '73 Javelin
- Occupation
- Retired auto mechanic, frmr gov't ntwrk security admin
- Vehicle Showcase
- 3
YT - youtube experts.YT? Not sure what that references?
Poking the bear early this morning I see... Pretty sure you said yourself in some thread 6 months ago that the aux battery being bad can cause the main to go bad over time - and your previous gladiator had major charging/battery issues for a long time. But whatever that doest matter - aux, main - the point being one being bad or not charging fully/correctly can damage the other in time. Emphasis on can. Many people remove them because it is a possibility, others remove them because they just dont want a little aux, others remove them for the purpose of installing the Genesis system, others remove them because they just can.
I personally removed mine for 2 reasons - 1) install of the Genesis system, and 2) I hated the idea of that tiny aux battery and its complications and just wanted it gone. In hindsight knowing now that my summer plans changed as much as they did, I would have only gone with point 2, and not done point 1 - but didnt know at the time I would have opportunities for three 5 day trips this summer.
My 2020 JT issues were resolved with an IBS reset and independently charging the main and aux batteries. It operated just fine to the point I traded it - the only time it wasn't was when it sat a while, like a few days.
If the aux battery dies in such a way that it becomes a drain, it will pull down the main battery. On the flip side - when the main battery goes bad, it drains the aux battery.
I have this bit in my head where I catch tidbits about articles -for some reason, some things stick with me (drove my boss nuts in meetings as he'd swear he said X and I said no, you said Y and later we could prove it. I couldn't tell you the date of the meeting, or the exact number he might have quoted, but I could recall the gist of it, and be close on the numbers. So he hated me being in some meetings)
Anyway, I've caught info in 3 different Jeep forums over the past year or so and the trend is that it's pretty much as common for the main battery to go as it is the aux, and one doesn't necessarily kill the other. It MAY, but the instances of such have been grossly exaggerated by those "YOU MUST DO THIS NOW OR BE STRANDED" YT (youtube) professionals.
Again - we've seen JT and standard Wrangler people just as often have main battery issues where the aux was fine - and for those who said "it's the aux battery that kills the main battery" explain, please, how then the 4xe 12v battery goes bad after even as short as a month, commonly 1 to 2 years.
There's no aux batteries.
The fact of the matter is - Jeep supplies crap batteries in their vehicles. This means ALL of their Jeep vehicles. They are crap. Even the 4xe people have been saying this.
The batteries in Jeep vehicles may last as short as a month (I've seen a couple of those cases lately) or as long as 3 years, but the most common appears to be 2 years tops. You are one of the lucky ones if a Jeep battery lasts 3 years.
There are things to do to make them last -
Keep them charged up.
Do not let it sit 3 or 4 or more days without a tender, and then drive it only 30 minutes.
These will NOT charge an AGM battery to 90+ percent SoC in 30 minutes. So if your Jeep sits 2, 3, or more days and you drive it 30 minutes, then park it again - you are killing your own batteries.
the problem is mostly how they are driven - or NOT driven, how often/frequently, or for how long.
I'm finding that it takes a total of 60 minutes drive time to get them mostly full.
My case is one for a tender - it sits quite often up to 3 or 4 days at a time, then is driven for 30 or 40 minutes.
That's where the issue is and I admit it.
My 2022 has only seen the 13.x volt range a couple of times since last December. That means the batteries are not being charged. The times it did get into the 13s, I'd been driving it a lot that day. Off and on the drive time added up to a couple of hours or more. So it was approaching full charge.
Remember, you are charging 2 AGM batteries - you have to add the capacity of both batteries together and figure you are charging one big battery. That means a lot of amperage has to go in to offset the parasitic draw of sitting for days on end.
I am going to go ahead and put the charger on mine today after doing some voltage checks.
Genesis appears to have done some things right - 2 equal size batteries, monitoring the charge of both or each, not just one and allowing you to keep the factory systems all in place if you wish.
Remember - this wasn't invented by Jeep and Jeep isn't the only car maker to use this system. It was used by GM and several others (who knows why GM dropped it - hmmmmm) so don't blame Jeep - unless you are blaming them for their implementation of it, or their shitty batteries.
If the 4xe has 12v battery issues - you know it's the battery. And like the 3.6 powered Jeeps - that 12v battery only charges when you use the vehicle, so sitting a lot is going to lead to short battery life.
People seem to not get that part - it's a lot of capacity, an alternator isn't a battery charger, and sitting with batteries at low SoC will kill your battery capacity. it's really that simple.
Either drive it, or maintain that battery.
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