I have a slightly over 3yr old 2.0 AH. I put it on the rapid charger this morning to recharge it as it had been awhile since I had used it. It started out like it was going to charge, as the green light came on and the fan also came on. After just a couple of seconds, one of the lights on the charger changed to red, the fan stopped and then the battery light also started blinking red. It charged my other batteries fine. Is this a sign the battery has gone bad?