I have a 2017 Jayco Seismic Wave Toy Hauler with the original 2 Interstate AGM batteries which are now 4 1/2 years old. It seems that the batteries are not holding their charge as long when not plugged into shore power. I've had it off shore power for 1 day with the Battery Cutoff switch not on, meaning batteries are still connected. Volt Meter shows around 11 volts, but when you turn the Battery Cutoff switch on, the reading is 12.5 volt or approx 80%. If you activate the landing gear switch while the Battery Cutoff switch is on, the reading goes from the 12.5 down to around 10.7 volts. Seems to me that the batteries are just holding a surface charge when at rest, but when you put a load on them, they are shot. Does that seem right to y'all? Thanks

Sounds about right to me. You could try an equalize charge but probably won't do any good in my view.

Post the converter model number. Good chance they have been under charged. You really need to get these up to 14.4 volts.Considering the low voltage it is probably best to separate the batteries for testing.

Have you cleaned and tightened the connections?I agree, if you have a factory converter it's probably not taking very good care of your batteries. I would separate them and test individually. One may be bad and the other okay. The problem with that is you don't want a new battery mixed with a 4 year old battery so you still would want to replace them both.

At 4 1/2 years old I would not be worried about meter readings. Time to replace the batteries with new and have peace of mind while camping. JMHO

I have no knowledge of Interstate batteries but my Lifeline AGM batteries would typically last 7-10 years with reasonable care.You have nothing to lose by trying a conditioning/equalization cycle. That is typically about 15.5 volts for 8 hours. If that doesn't fix the issue they are toast.

Problem with AGM Batteries | Good Sam Community

La_Gasser
Explorer
Apr 25, 2021
Converter is the factory Progressive Dynamics Model PD4590K 90amp unit. Connections have been maintained clean. When on shore power, meter shows in the 14.4 to 14.6 range initially, then reduces to the 13.2 to 13.4 range when charging so that appears ok. I also had Lifeline AGM batteries that were over 8 years old when I sold the previous trailer, so am disappointed with the life of these Interstate batteries, but it could be Jayco issue more than a battery issue. Will probably replace both with Duracell AGM's from Sam's Club. I've had good luck with their batteries in vehicles and my boat.
JimK-NY
Explorer II
Apr 25, 2021
I have no knowledge of Interstate batteries but my Lifeline AGM batteries would typically last 7-10 years with reasonable care.

You have nothing to lose by trying a conditioning/equalization cycle. That is typically about 15.5 volts for 8 hours. If that doesn't fix the issue they are toast.
Bill_Diana
Explorer
Apr 25, 2021
At 4 1/2 years old I would not be worried about meter readings. Time to replace the batteries with new and have peace of mind while camping. JMHO
KD4UPL
Explorer
Apr 25, 2021
Have you cleaned and tightened the connections?
I agree, if you have a factory converter it's probably not taking very good care of your batteries. I would separate them and test individually. One may be bad and the other okay. The problem with that is you don't want a new battery mixed with a 4 year old battery so you still would want to replace them both.
time2roll
Nomad
Apr 25, 2021
Post the converter model number. Good chance they have been under charged. You really need to get these up to 14.4 volts.

Considering the low voltage it is probably best to separate the batteries for testing.
Ed_Gee
Explorer II
Apr 25, 2021
Sounds about right to me. You could try an equalize charge but probably won't do any good in my view.

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