When jetting the bike, I had tried to start a poorly jetting bike, and noticed that the battery, fresh from overnight charging, would spin the starter for about 20 seconds before becoming weak. Wait a few minutes, and there was maybe 5 seconds of juice left for the starter. When the bike runs great, I only need 1 or 2 seconds to start, but I don't want to be stranded with only 20 seconds of battery life for the starter. What should I expect? Time for a new battery??