Do I need to disconnect the battery from the car to charge it?

[tawheed]

I picked up a CTEK 3300 maintainer for my car to use over winter storage. Question is, do I need to disconnect the battery from the car to use this unit or can I just hook the quick connects up to the terminals, leave the terminals hooked up and plug it in?

I've only ever stored motorcycles and I used to remove the battery from the bike and bring it in to the house.

Thanks!