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Old 11-22-2020, 02:12 PM   #1
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Batteries died at dealer

I took my 2019 23FB to the dealer for some warranty work. It was there for about 2 months due to a protracted fight with HQ about the warranty. When I picked it up the batteries were at 7.5V. Took them to Interstate after charging them. One is dead, and the other is likely dead. It's on the reconditioning charger. Of course they are just out of warranty. On the way home I thought "OK, not so bad, I can upgrade to 6V". Then, I looked at the prices for that.

Ugh. I heard that AGM batteries are resistant to damage due to deep discharge? Is that true? Any experience here?

Note: I have a progressive dynamics 4 stage converter, and a disconnect on each battery, which I guess I'll need to use every single time I go to the dealer
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Old 11-22-2020, 02:16 PM   #2
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Batteries died at dealer

If you let any lead acid battery, AGM, flooded or otherwise hit 7.5v it will never function the same again. You should avoid discharging any lead acid battery below 50% / 12.2v - AGM, flooded or otherwise. If you repeatedly discharge more than 50% you will absolutely shorten their working lifespan.

Dealer should replace the batteries after their mistake, especially with the convenience you’ve provided with after market disconnects.
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Old 11-22-2020, 02:18 PM   #3
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If you let any lead acid battery, AGM, flooded or otherwise hit 7.5v it will never function the same again.

Dealer should replace the batteries after their mistake, especially with the convenience you’ve provided with after market disconnects.


Agree
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Old 11-23-2020, 01:40 PM   #4
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AGMs can handle deep discharge much better than flooded lead acid batteries. An equalization charge might even bring them back close to what they once were.

But there is no free lunch. Even if you are able to get a proper open circuit voltage with them, this low voltage excursion will have reduced the quantity of cycles remaining in your batteries.
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Old 11-23-2020, 01:56 PM   #5
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. . .
Dealer should replace the batteries after their mistake, especially with the convenience you’ve provided with after market disconnects.
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Originally Posted by leedav View Post
Agree
x3!

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Old 11-23-2020, 02:19 PM   #6
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SNIP QUOTE()<><)Note: I have a progressive dynamics 4 stage converter, and a disconnect on each battery, which I guess I'll need to use every single time I go to the dealer....
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With note on the switch telling them.
TURN OFF WHEN NOT USING

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Old 11-24-2020, 04:41 AM   #7
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Mo' Bettah

May be mo' bettah to turn off batteries before you leave, and have the sign say something like "turn on temporarily for work, and then turn back off !!!"

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Old 11-24-2020, 07:26 AM   #8
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Good luck with having the dealer turn a switch on or off. Protecting the battery is not rocket science! A $10 extension cord will save $300 or more of batteries, but they don’t care because they get away with the customer eating the cost of replacement, or even profiting from an “unexpected “ sale. Hold their feet to the fire!
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Old 11-24-2020, 07:42 AM   #9
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Originally Posted by GetawA-S View Post
Good luck with having the dealer turn a switch on or off. Protecting the battery is not rocket science! A $10 extension cord will save $300 or more of batteries, but they don’t care because they get away with the customer eating the cost of replacement, or even profiting from an “unexpected “ sale. Hold their feet to the fire!
Well, you could always take the batt's home with you.

Bob
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Old 11-24-2020, 08:44 AM   #10
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Well, you could always take the batt’s home with you...

Not bad advice. Would any dealer provide the labor and hand cart to assist?
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Old 11-24-2020, 07:06 PM   #11
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Originally Posted by GetawA-S View Post
Good luck with having the dealer turn a switch on or off. Protecting the battery is not rocket science! A $10 extension cord will save $300 or more of batteries, but they don’t care because they get away with the customer eating the cost of replacement, or even profiting from an “unexpected “ sale. Hold their feet to the fire!


Cold day in hell before I buy the replacements there
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Old 11-24-2020, 07:07 PM   #12
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Well, you could always take the batt's home with you.



Bob



Yeah. And then have them plug it in and the dangling wires go BOOM
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Old 11-25-2020, 12:30 PM   #13
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Are the batteries at Costco the same? They’re a lot cheaper
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Old 11-25-2020, 12:57 PM   #14
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My batteries were bad when I purchased the Airstream new. Of course Interstate swapped them out no questions asked under warranty. Then the batteries nearly died when I stored the trailer for 2.5 weeks. Either disconnect or take them out for long periods. I was blown away how fast they drain from the parasitic draw.
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Old 12-05-2020, 01:18 PM   #15
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Epilogue: dealer makes good. Batteries being changed out right now!
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Old 12-05-2020, 02:13 PM   #16
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Batteries

I just replaced my 4 1/2 year old interstates. I researched for group 24 AGM’s and bought 2 Duralasts at Autozone. If you are a veteran they give a discount.
I wired a waterproof digital voltmeter in the battery box so I can monitor the battery’s voltage.
I have a disconnect switch on the batteries. With the disconnect switch and the house disconnect switch you can completely isolate the batteries. Works great.
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