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02-06-2019, 02:16 AM
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#1
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Junior Member
Brand: Thor Motor Coach
Model: Miramar 34.4
State: Colorado
Posts: 19
THOR #11850
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6 volt Battery replacement
I have a 2017 Miramar. There are two 6 volt Batteries in it. One of the batteries is bad and needs to be replaced. Can I replace just the one battery or do I need to replace both batteries.
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02-06-2019, 02:38 AM
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#2
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Senior Member
Brand: Thor Motor Coach
Model: ACE 30.2
State: Massachusetts
Posts: 441
THOR #8180
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Typically you'd only need to replace the bad battery. To verify the good battery is actually good charge the battery as you normally would. Remove it from the charge and test the voltage 12-24 hrs later. A 6V battery should have 2.15V per cell or about 6.4V. Depending on the age of the battery these can be a bit lower. Anything significantly lower would indicate a bad battery.
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USN - RETIRED NUKE
Taunton, MA
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02-06-2019, 03:25 AM
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#3
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Senior Member
Brand: Thor Motor Coach
Model: Hurricane 29M
State: Texas
Posts: 2,672
THOR #11781
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I always do 6 volt batteries in pairs.
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Lt Keefer
2018 Hurricane 29M
CHF, Saf-T-Plus, SumoSprings
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02-06-2019, 04:12 AM
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#4
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Senior Member
Brand: Thor Motor Coach
Model: Gemini 23TR
State: California
Posts: 981
THOR #6701
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I have always understood that the oldest battery will bring down an new battery to its level. Therefore always change out both. Now that is from a battery supplier, but one I trust.
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2017 Gemini 23TR Ford chassis w/ power stroke 3.2
DW, Daughter and 2 dogs, Sofie (black lab/boxer) and Phoebe (schnoodle)
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02-06-2019, 01:05 PM
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#5
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Senior Member
Brand: Thor Motor Coach
Model: THOR Chateua 35SF
State: Florida
Posts: 5,850
THOR #11130
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Both...always, unless one goes bad within a few weeks of them being purchased together as new.
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Now an SOB
Traded Thor for Melbourne Prestige 24NP
2018 THOR Chateau 35SF
Two Labs, Bugsie & Blondie
Blondie passed in 2020 at 5 to Leukemia
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02-06-2019, 01:37 PM
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#6
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Site Team
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 14,128
THOR #7035
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Quote:
Originally Posted by mountainsam
I have always understood that the oldest battery will bring down an new battery to its level. Therefore always change out both. Now that is from a battery supplier, but one I trust.
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That may be true for batteries in parallel but for batteries in series the only way one can effect the other is by limiting the current flow either in or out, and that's the problem with mismatched series batteries: equalizing the state of charge with different "internal resistances". Best to replace both unless you just did and got a dud.
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Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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02-06-2019, 01:47 PM
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#7
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Senior Member
Brand: Thor Motor Coach
Model: 2017 Axis 25.4
State: Arkansas
Posts: 2,669
THOR #12231
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Yes, what they said... replace both.
Have you thought about what your going to replace them with? Lead Acid or AGM?
How long do you plan on keeping your RV? If a long time I would recommend AGM's.
Brand preference?
I like the Full River brand.
I went with the Full River AGM 6 volts / 220 amp for my Axis and I love them.
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2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, TPMS, Surge tank, Tornado flush, Viair Compressor
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02-06-2019, 03:58 PM
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#8
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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Could you "sneak by", and just replace one?
Probably.
But wouldn't it be better (but not cheaper..), to just replace both, and feel better about the condition of the rig's ability to store power?
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"What: me worry?"
Good Sam Member 843599689
Current coach: Tiffin Wayfarer 24 BW
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02-06-2019, 04:44 PM
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#9
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Senior Member
Brand: Thor Motor Coach
Model: 2017 Axis 25.4
State: Arkansas
Posts: 2,669
THOR #12231
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Yeah but since he has 6 volts he needs two good ones to make the 12v system and the old one will have more resistance (I think) and cause problems with charging charging and discharging unevenly.
Kinda like tires... they say to at least replace in pairs.... sure you could do one tire but in the long run TWO is much better for proper handling etc.
Even if I had two 12v I think I would replace both at the same time to be safe (Unless they were only like 6 mo old then I would not worry about it).
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2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, TPMS, Surge tank, Tornado flush, Viair Compressor
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02-08-2019, 01:39 AM
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#10
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Senior Member
Brand: Thor Motor Coach
Model: Tuscany 40ex
State: Ohio
Posts: 443
THOR #12726
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As a general rule if both batteries are the same age I would replace them both, but you can just replace 1 if the amps are the same.
I have 4 6volt batteries in mine 2 paired in series giving me 2 sets of batteries @ 12 and the 2 pairs are in parallel.
2 6volt batteries in series will give you 12volts and amps stay the same,but when you put 2 sets in parallel the voltage will stay at 12v and you the double the amps.
I can go 24 hrs with lights fridge and tv before I need to start generator or plug in.
Most 6volt batteries have a higher amperage rating then 12v
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