Checking water level in your RV battery should have been discussed in any maintenance booklets/manuals and or a correct PDI. But, since this is the 1st time your learning about it, just think about an RV like this, it is not like a auto or house at all regarding maintenance.
Yes your right your auto likely has maintenance free batteries. In Rvs, there are some and a great cost, not many have them. Pull the battery cover off and check it. Any caps that are removeable need to be checked for water level. If the level is down to or below the plates in the battery, it is failing now. It may never be 100% again.
BTY, if you want to use the RV camping without shore power even over 1 night get a second battery. You need the extra amps a 2 battery system provides or add solar or a generator to the RV. Batterie(S) should always be replaced at same time. Putting a new battery in with a used one will bring the new one down to the performance of the older one.
Please ask questions on any RV related issue, no one on here will pick on you or should. We or at least most learned the hard way on most RV stuff way before the web was up.
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2013 24RKSWE (27ft TT) Cougar 1/2 ton series SOLD 10-2021
2013 Ford F350 4x4 CC 6.7 engine, 8 ft bed, 3.55 rear end, lariat package
Retired from Oregon State Police in 2011 than worked another 9.5 years as a small town traffic cop:
As of 05-2020, I am all done with 39 years total police work. No more uniforms for me.
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