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Old 11-23-2013, 10:30 PM   #1
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When to change batteries

The home batteries in our coach are 6 years old. The reading is 12.5 but there is crude on the terminals. How can I make certain it is time to change batteries?
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Old 11-23-2013, 11:22 PM   #2
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Originally Posted by stevelear View Post
The home batteries in our coach are 6 years old. The reading is 12.5 but there is crude on the terminals. How can I make certain it is time to change batteries?
I am no battery expert, but if they are not giving you any problems they may be fine for a few years. Check the water level, clean off the terminals with baking soda and water or a coke. Wipe off any dirt on the top of the battery. Use a battery brush on the terminals and then use a terminals protectant spray on the terminals( found at any auto part store or walmart). You can check the each cell with a battery hydrometer also at any auto part store or Walmart for around $9
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Old 11-24-2013, 02:34 AM   #3
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I swapped ours out at about that age.

Bought the new ones at Costco in case I had problems somewhere across the country.
2004 Monaco La Palma 36DBD, W22, 8.1, 7.1 MPG
2000 LEXUS RX300 FWD 22MPG 4020 LBS
It's so weird being the same age as old people.
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Old 11-24-2013, 07:20 AM   #4
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You know it is time when:
- a load test reveals a bad battery
- when they won't take/hold a charge
- when one has "bulging" sides
- when one is hot to the touch
- when one cracks and leaks
or, if you failed to notice the last three;
- when one explodes

They can last a long time or not depending on how they have been used and how they have been charged.
Paul (KE5LXU) ...was fulltimin', now parttimin'
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Old 11-24-2013, 07:33 AM   #5
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Simple,when they quit holding a charge.
2007 Fleetwood Revolution LE 40V
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Old 11-30-2013, 04:01 PM   #6
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Originally Posted by Tha_Rooster View Post
Simple,when they quit holding a charge.
I agree. The first set of house batteries in our 01 Adventurer only lasted 4 years due to my own abuse/ignorance. The second set lasted 8 years. The starting battery lasted 11 years.

You might think this is a bit t out of the ordinary, but we have a 2004 Jeep Wrangler that still has the original battery. In addition I have an end loader that has the original battery from my 1999 Ford truck. When the truck was a little over 4 years old I replaced the battery thinking it wasn't long for this world. The truck is long gone but the 14 year old battery still starts the loader whenever I need it.

By the way -20*F days aren't uncommon in our neck of the woods.
2013 Adventurer 32H
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Old 12-22-2013, 06:18 AM   #7
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I replaced mine after 10 years. They wouldn't hold a charge for long after 8 yrs, but we always use shore power and didn't really have to worry!
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Old 12-22-2013, 06:55 AM   #8
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Load test
Specific gravity check
Physical inspection

If above ok and no operational issues you are good for awhile longer.
Vince and Susan
2011 Tiffin Phaeton 40QTH (Cummins ISC/Freightliner)
Flat towing a modified 2005 Jeep (Rubicon Wrangler)
Previously a 2002 Fleetwood Pace Arrow 37A and a 1995 Safari Trek 2830.
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Old 12-22-2013, 12:35 PM   #9
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All of the discussions above talk about checking your batteries to see if they're bad or not and NEED replacement. Many of us don't wait until then. If you use your coach a lot or are planning a big trip, it's probably time to do some preventative maintenance and replace them. I would rather replace mine at home than on the road.
Don & Mary
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Old 12-22-2013, 12:43 PM   #10
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Welcome to irv2.
Look in my signature below there are three links and it will explain all you need to know about your battery system , wiring system and much more for your Newmar.
Enjoy the forums.
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Old 12-23-2013, 09:12 AM   #11
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Replaced mine at 11 years after testing.
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Old 12-24-2013, 03:42 AM   #12
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Remove and clean the terminals and posts replace and tighten all connections as a start. The only way to really check your batterys is a load test. Although as others have said bulged or hot batterys are a sign of a problem. With proper charging and charger settings and a little TLC house battries will last a long time, mine are 9 years old and still running at about 90 % compacity.
Bruce Linda and Zoey
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