Yes your alternator is charging.
Yes that is about normal.
Yes you will have to disable the alternator by pulling the belt( if able to) or with a kill switch.
Your alternator is working less hard with a full charge to start with, so there is some benefit, and the deep cycle is more suited to this kind of use than a regular automotive starting battery.
You are moving along the same path that I am, but I have a few larger fish to fry before I get back to alternator work. I have the kill switch already working, but the old starting battery I have won't die.
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