Battery no charge 2025

[PapaIgneous]

2025, 3100 miles, system shows 14.5v when driving. When in ACC(blower off and radio off) battery shows 12.3v and drops to 11.8 within 90 seconds. Tried resetting IBS and ran for 2 min. System shows 12.2v, used meter and verified at 12.2V. Dealership just replaced TCM for some power drain symptoms that went away when changed out and also fixed hard shifting and degrading mpg. I’m going to do battery load test to check battery since that’s also a common issue. But this was dealership visit #2 and it’s an hour drive away so once this hits state limit I’m gonna drop it in their lap. Any ideas?

 

[Ramjamb]

Tim Kuniskis with Ram recently confirmed they were dealing with bad batteries from suppliers on 2025's. 14.4 volts running is good. 12.2 volts and below is bad.

My 2022 5.7 won't even start at 12.2 volts. Verify the battery is good first.

 

[rylock21]

2025, 3100 miles, system shows 14.5v when driving. When in ACC(blower off and radio off) battery shows 12.3v and drops to 11.8 within 90 seconds. Tried resetting IBS and ran for 2 min. System shows 12.2v, used meter and verified at 12.2V. Dealership just replaced TCM for some power drain symptoms that went away when changed out and also fixed hard shifting and degrading mpg. I’m going to do battery load test to check battery since that’s also a common issue. But this was dealership visit #2 and it’s an hour drive away so once this hits state limit I’m gonna drop it in their lap. Any ideas?

Any update?

 

[Rebellion is Duty]

Recently, dealer replaced both batteries in my '25. The secondary battery had a bad cell and caused issues with the primary battery. There are many posts here about battery issues and replacement. New batteries made a lot of problems go away.

 

[MotorcycleBoy]

My Italian importer dealer also replaced the AUX battery.
R
That's almost always the culprit.

Sent by SM-F766B on Tapatalk

 

[PapaIgneous]

Any update?

Any update?

I haven’t had any issues with starting since I got it back. Better mpg and shifting is better.

 

[Bsjoiner]

My truck is a 25 Tungsten and was fine for the first year and 9,000 miles. Recently I had a dead battery and now it seems like the truck is barely charging the battery. Voltage is a little over 13V while driving. I replaced the main battery but the problem persists. Could it be the secondary battery causing my problem?

 

[Paul B]

My truck is a 25 Tungsten and was fine for the first year and 9,000 miles. Recently I had a dead battery and now it seems like the truck is barely charging the battery. Voltage is a little over 13V while driving. I replaced the main battery but the problem persists. Could it be the secondary battery causing my problem?

As posted, not remembering where, the answer is yes on the secondary battery.
Wouldn't hurt to have it tested, i.e. a true load test.
Paul B

 

[Bsjoiner]

Does anyone know the size for the secondary battery? I’m just going to buy a new one. I hate going to the dealing and dealing with their BS and a rental car etc.

 

[UnloosedChewtoy]

Does anyone know the size for the secondary battery? I’m just going to buy a new one. I hate going to the dealing and dealing with their BS and a rental car etc.

The secondary battery, according to a few auto parts sites, is called "group 400" or "AUX14." Fairly common, looks like.

EDIT: Looks like O'Reillys SuperStart has a 4 year free replacement warranty on theirs. Many of the others I'm finding at other places are 3 years or less.

 

[Rebel_Tom_2025]

2025, 3100 miles, system shows 14.5v when driving. When in ACC(blower off and radio off) battery shows 12.3v and drops to 11.8 within 90 seconds. Tried resetting IBS and ran for 2 min. System shows 12.2v, used meter and verified at 12.2V. Dealership just replaced TCM for some power drain symptoms that went away when changed out and also fixed hard shifting and degrading mpg. I’m going to do battery load test to check battery since that’s also a common issue. But this was dealership visit #2 and it’s an hour drive away so once this hits state limit I’m gonna drop it in their lap. Any ideas?

My 2025 Rebel has 5K miles on it and one morning it was dead. I could not even jump it, had to have it towed to dealership. They replaced both batteries and a fuse array.