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03-03-2018, 04:23 PM
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#1
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Member
Winnebago Owners Club
Join Date: Mar 2012
Location: Cleveland, Tn
Posts: 36
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Battery dilemma
My 2 - 12v house batteries are 5 years old. Their serial numbers are within 2 units and they've been connected in parallel since the get-go. 1 of the 2 will not / does not hold a charge. My dilemma is: do I just replace the bad battery or because of their age, replace both of them?
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03-03-2018, 04:25 PM
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#2
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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Both.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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03-03-2018, 04:27 PM
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#3
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Senior Member
Join Date: Aug 2017
Posts: 235
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I would replace both but that's me you could have the good one checked but in my opinion 5 years is a good run
Sent from my LG-H910 using iRV2 - RV Forum mobile app
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03-03-2018, 04:32 PM
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#4
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Senior Member
Join Date: Sep 2015
Location: Urbanna, VA
Posts: 1,159
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Another vote to replace both.
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03-03-2018, 04:35 PM
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#5
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Senior Member
Join Date: Jul 2014
Posts: 35,442
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Both, at that age. The good one is on borrowed time.
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03-03-2018, 04:37 PM
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#6
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Senior Member
Join Date: Dec 2014
Location: East Tennessee
Posts: 980
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Quote:
Originally Posted by Mr_D
Both.
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^this
__________________
2016 R-Pod 176T
2002 Avalanche Z71 Tow Veh
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03-03-2018, 04:59 PM
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#7
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Senior Member
Join Date: Aug 2017
Posts: 2,104
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You have to replace both batteries . After 5 years the battery charge / discharge characteristics have changed significantly . An older battery will require a higher voltage to reach full charge. You will end up overcharging the new battery and undercharging the old battery , both conditions will shorten the life of the battery. The life of the batteries is around 5 to 7yrs , so they are due for replacement.
__________________
1993 Tiffin Allegro Bay 32'
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03-03-2018, 05:44 PM
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#8
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Senior Member
Join Date: Oct 2015
Location: N.W.Ohio
Posts: 123
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Quote:
Originally Posted by Motor7
^this
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X2 
__________________
N/W Ohio, 2003 Newmar Mountain Aire 3781, American Car Dolly, F&R Trak Bars, Roadmaster F&R Sway Bars, Koni Shocks, Blue Safe-T-Plus
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03-03-2018, 05:52 PM
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#9
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Senior Member
Join Date: Mar 2008
Posts: 269
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Both so you don't have the same problem down the road!!!! Keep the good one for a spare for one of your other Vehicles!!!!
Safe Travels
Steve
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03-03-2018, 06:17 PM
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#10
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Senior Member
Fleetwood Owners Club Ford Super Duty Owner
Join Date: Jun 2012
Location: SoCal
Posts: 15,749
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Easy. Both. For sure.
__________________
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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03-03-2018, 06:36 PM
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#11
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Senior Member
Forest River Owners Club
Join Date: Mar 2013
Location: Northern United States
Posts: 339
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Both. As stated the battery characteristics change with time. It is best to have batteries wit h the same charge/discharge characteristics...so replace both. And at 5 years you have gotten most of the value out of the batteries. I expect my batteries to last 5-8 years with really good care.
__________________
Brad & Bonnie
2015 Ram 3500 Laramie 4x4 and 2018 Columbus 383FBH
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03-03-2018, 06:54 PM
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#12
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Senior Member
Join Date: Dec 2011
Location: FULL TIMER
Posts: 137
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Both
__________________
Len & Sally
2014 Mobile Suites 36RSSB3 2013 F350 DRW w/Trailersaver & air shocks
800 Watts solar, Tristar MPPT 45 & 460 AMPS Storage
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03-03-2018, 07:02 PM
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#13
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Senior Member
Spartan Chassis
Join Date: Dec 2011
Location: Anywhere, USA
Posts: 451
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If money is available replace both. It is both a wise economic and good technical decision.
If you have made the choice to replace both batteries then you have to decide with what and which manufacturer.
Lead acid, AGM or really out there lithium.
Are you only dry camping occasionally? Happy with your existing battery capacity? Then replace in kind with lead acid. Many good manufacturers here.
More serious boon docker? Then look at AGM batteries and maybe a increase in capacity (amp rating). Solar could be added on to any battery system.
Boon dock for months, money is no barrier and have to have the latest Apple phone? Then look at lithium batteries/adding Solar with a big jump in capacity.
Good Luck!
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03-04-2018, 07:46 AM
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#14
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Member
Winnebago Owners Club
Join Date: Mar 2012
Location: Cleveland, Tn
Posts: 36
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Thanks for all your inputs - 2 new batteries it is! Looking at AGM's.
As an aside --- checked voltages on both batteries this morning (both have been disconnected from each other and all loads) and both are at less than 10.5V . Both are bad: one just took longer to die 
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