My understanding, if the only difference is a lack of access due to no fill caps, it is no different than any other lead acid battery.
Some have cleverly hidden flush with the top caps that can be pried out.
But typically, a battery in normal use will not need to be refilled. In fact, what I have found, trying to keep one full to the bottom of the fill ring indicators will result in the top staying wet, and the terminals constantly corroding. This is especially true in off road, marine, and hard riding trucks where there is a lot of bouncing around. Best to let them seek their own level as long as the plates are just covered, and they may even be visible, right at the surface.
Then there are the totally sealed types, AGM, gel batteries. Those are not to be serviced or disturbed in any way.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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