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Author Topic: Life span 5th wheel batteries  (Read 683 times)


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Life span 5th wheel batteries
« on: June 13, 2017, 03:16:25 PM »
What is the approximate life span of 5th wheel batteries?  Mine are not marked with purchase date.  Current batteries are Interstate marine/rv SRM-27. 

Roy M

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Re: Life span 5th wheel batteries
« Reply #1 on: June 13, 2017, 03:53:24 PM »
Batteries tend to be less than reliable after 5 or 6 years although the two year old in my winter beater recently took a dive. Have it fully charged and load tested, it's not a guarantee but should give a pretty good indication of condition.

Rene T

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Re: Life span 5th wheel batteries
« Reply #2 on: June 13, 2017, 06:08:30 PM »
Rene, Lucille & co-pilot Buddy
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Re: Life span 5th wheel batteries
« Reply #3 on: June 13, 2017, 07:47:28 PM »
Depends on the battery and how often you discharge them to less than 50% charge.  If you boondock a lot I wouldn't expect more than 3-4 years out of a good quality group 27 12v battery.  We did, and that's about the best we ever got.

6V T105 or Golf Cart batteries fare a little better.  5-7 years.  Thicker plates and more lead.  But again, it depends on how you treat them.

« Last Edit: June 14, 2017, 05:55:08 PM by 8Muddypaws »
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Gary RV_Wizard

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Re: Life span 5th wheel batteries
« Reply #4 on: June 14, 2017, 10:19:38 AM »
Those marine-type 12v batteries are lucky to last 3 years, whether used much or not. If abused, they may last only a year.

Are they working now? Hold a charge OK, e.g. little voltage drop when not in use, and a reasonable amount of use hours?  If not, replace them and get a true deep cycle battery rather than a marine/RV type. They cost more but will last 2x-3x as long with reasonable care.
Please read my article about RV Batterries in the Forum Library at http://www.rvforum.net/miscfiles/Choosing_right_battery.pdf
Gary Brinck
Summers: Black Mountain, NC
Home: Ocala National Forest, FL