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Wow, 15 degrees is pretty good haha
Mind you, I'm in Toronto, and was a block away from Lake Ontario so it got really cold down there in the negatives. Given that, I think you should be okay to leave it alone and not have to check as often but that depends on how long you plan on leaving the car there. I don't know which car this is for but I think your solution should work. I feel that a Jackery might be overkill for your application so I think a portable charger like another Noco will work. You'll have to do the math to figure out what works best for you.
I know a few people have advised to fire the car up to run for a bit or drive it around the parking lot, but the revs and duration will not be long enough for the alternator to charge the battery. Doing this would accelerate the battery wear and eventually kill it (@Eff-1 - this happened to my significant other who went through this and now the Yaris is dead haha)
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