Being a firm believer in "if it is not broken, do not fix it" I have never used a battery charger/tender. During the winter, like now, I simply remove the battery from my 09, and take it inside the house, even though the bike sits in the garage.
4 weeks ago, I wanted to go riding, so I took the battery and dropped it in the bike, tightened the screws and it fired right up. Damage to batteries occurs during extremes of hot and/or cold. So, since my batteries sit at an average temp of 66-72 degrees F in the winter, they do just fine.
To facilitate removing and replacing the battery in my bike, I have a small strong string around the battery. I simply unscrew the POS and NEG terminals, push the wires to the side, grab the string and lift straight up. Piece of cake and takes about 1 minute. Inserting the battery I simply push the wires aside, and lower it in place, then screw the cables on.
FWIW - to avoid damaging the battery, when I install it, I always screw the POS terminal First. When removing the battery, I always unscrew the POS terminal last. This avoids having current flow when I doing the POS terminal so no danger of "arcing" and damaging anything.