Personally, I'd remove it from the car.
The battery is held in an enclosed space and without air passing under the car to make the vent hose work, the likelyhood of a Hydrogen buildup is higher than another car.
You expect your maintainer to work flawlessly all winter, which in all probability it will.
But, if it doesn't, you could have problems ranging from the battery boiling acid out all over the inside of the battery box, to a bomb.
Low probability to be sure, but since removing the battery is so easy, why take the risk? Just my $0.02 Ca
Cheers!
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