I would pull the battery. I've done this the past two years and every spring the battery's fresh and has worked flawlessly.
Our winters last long enough that we don't ride between 5 to 6 months. During this time, if the battery is left in the bike, it will drain off due to its internal resistance as well as a small amount of current from the ECU. Over time, if not tendered and the voltage kept up, it could freeze in sub-zero temperatures and risk being destroyed. That will cost you over $100 to replace. In my books that's worth pulling.
1. Place bike on centerstand.
2. Remove the seat.
3. Remove both small inner fairing black panels via two bolts with 4mm hex socket on each side of fairing.
4. Remove two front tank bolts with 5mm hex socket
5. Lift tank and prop up with proper support (stick or something)
6. Unplug main fuse connector on top of battery cover
7. Remove battery post bolts, negative first, then positive
8. Remove top battery cover via two bolts on side closest to the front. The rear set hold the battery box to the frame.
9. Lift off battery cover to the right side.
10. Lift battery out.
Re-assemble minus battery in reverse order. Bring battery inside and tender battery with a smart charger once a couple of weeks for a few days. That's what I do.