I only ride my bike recreationally at weekends and usually only for about 25-30 miles. As soon as the engine cools, I hook it up to a battery tender until the next ride. The red light stays on for at least 10 mins (ie: fully charging) before it flashes green for about 10 mins (>80% charged), then solid green (tending fully charged battery). My question is, shouldn't the battery be fully charged at the end of a 30 miles ride? I am concerned that the bike's charging system is not working properly.