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I admit I have very limited experience to know a good battery from a weak one except I am getting no warning of trouble on this one so far.
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I would grid charge it once, then wait until you start getting recals or it starts throwing codes or force-charging a lot, then you can get an idea of any issues it has. Grid charging every night seems like overkill, and won't really give you a chance to see the actual condition of the IMA battery. Plus, the 12V battery tender should keep the IMA from charging the 12V too much. You do have a lot of extra instrumentation, though, so it's hard to tell how much juice all that takes.
Maybe consider pulling the EPS fuse to offset some of the extra draw. Or a solar tender like I have on mine to keep the 12V topped off.