Most (good) battery maintainers have leads that connect right to the battery poles & you just plug it into household type current. Therefore I would not bother to disconnect the battery. Of course I live in Florida now so there is really NO dormant season but I still use a battery maintainer between rides.
Irish
P.S. I used to ride year round when in NH but I was also younger then. I also had booze to keep me warm but now I quit drinking & got more sense !