Its says in the owners manual, "Never charge the batteries for more than 24 hrs." Which I wasn't it was closer to 9 hrs. But I got the bright idea of putting it on a outlet timer to reduce the time its on the charger after its charged. Now it has about 66% of its range. It has about 150-200 charges on it. The manual says it should be good for 300. It could just be a sign its coming to the end of its natural life. What do you think, its showing its age or did I wound it with the timer?