For the Odyssey, they have an approved list of chargers that they recommend for their batteries - I don't think the NOCO's are listed. Here's the list:
https://www.odysseybattery.com/documents/ODYSSEY_approved_12V_chargers.pdf
...
I ended up going with the CTEK Multi US 7002 - a few other Xterra Odyssey owners recommended it:
https://www.amazon.com/gp/product/B000FRLO9Y/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
May be a bit more $$ than what you were looking for, but it works great and I have piece of mind that I'm not damaging the battery and shortening its life.
That's a lot of good info, thank you.
Thanks for the recommendation.
Odyssey Charger FTW!
I have one if you need to borrow it.
Thank you Rob, that's generous of you!
Sorry, I have been neglecting following up on this thread I started. This was a one day sale that could sell out at any time. I had waited until later that day before BillySpivitz posted, and I went ahead and bought the Noco G3500 charger, not seeing anything suggesting otherwise in my small amount of research. Oh well.
It sounds like it might not be the best option, but it was too hard for me to pass up the $35 price. Plus, if you poke around the internet enough you can find information that directly contradicts other information... apparently Odyssey used to be OK with recommending the Noco for their batteries:
http://www.vansairforce.com/community/showthread.php?t=125488
And some other positive feedback here:
https://www.ferrarichat.com/forum/threads/battery-maintainer-for-odyssey-battery.436200/
But more recent posts (including here) are saying the Noco is not great for the Odyssey. So for now it's still in the box unopened.
Here's my follow up question: For someone with just one battery, what is the actual real world benefit of having your AGM battery fully charged?
As I understand it, our alternator / charging system can't do it alone... it will only bring it to a certain state of charge, because the voltage it's putting out is not high enough. This is why you need the special approved list fancy charger, right?
Imagine this hypothetical situation. You're going out for a day trip (or overnight, or weekend) of wheeling and exploring in the desert or the mountains. You drive an hour or two to get there, using your headlights, stereo and HVAC. You air down your tires, then spend hours driving around having a great time, still using electrical accessories, maybe even your winch. When you're done and it's time to go home, you air back up (using your electrical compressor) and drive an hour or two back home.
Wouldn't your battery now (or even during this trip) be back to where it was had you not used the charger at all... at the state of charge you'd get from your vehicle charging system alone? Or does it somehow hold on to the higher state of charge through all that electrical draw?