If your running the same battery that came with your F6B, kudo's. They will definitely last if you keep a battery maintainer on them during non-use. I keep my F6B connected via pigtail to the battery constantly when I'm not riding it.

Best for you to go OEM again. I've had Duracell batteries in group 34 before. They don't last long.

Don't cheap out on your motorcycle battery.

Let me repeat that. Don't cheap out on your motorcycle battery.