I installed a new battery a couple years ago. I'm not a daily commuter, so my bike often sits for a week, sometimes two before its ridden again. I do keep on a tender if it sits more than two weeks. Lately, I've noticed it turns over slowly when restarted during a ride. I'm not sure if it's the battery or the starter. Any ideas? Could it be the battery is getting old? The bike fires right up when cold (coming off the charger). Thanks in advance for any advice. Cheers.