After 13 years of service, my battery tender dropped dead. About 2 weeks ago I disconnected the Z from the tender and went to start it and nothing happened. I plugged the tender back in and noticed it was fast flashing a green light. I'd never seen that before in all the years of using it. I pulled the battery and hooked it to a re-conditioner in my shop and let it do its thing over night. Once fully charged I hooked it back to the tender and the same thing happened. No juice. So I replaced it with an updated model. Hopefully this one lasts just as long.