When the weather gets really cold in Chicago and the roads get full of snow and road salt, I will have to park my busa for a spell and tend to my battery. Some of you folks recommended a charger called Battery-
?? (either battery tender or battery minder).
Can you use this contraption with batteries that are sealed (maintenance free batteries)?
And how cold does it have to get before I have to remove the battery and put it on the charger?

Can you use this contraption with batteries that are sealed (maintenance free batteries)?
And how cold does it have to get before I have to remove the battery and put it on the charger?