This morning went to start my X after its long winter nap. Door wouldn't open - no power! Check the Battery Tender Plus and the green light was on, as it had been all winter. I faithfully checked all winter to make sure the light was on and everything was OK. Opened trunk with key, opened hood and checked. Battery had 0 volts. OH NO!! Checked Battery Tender. In line fuse was blown. Checked Tender manual. Says if not connected to a battery (which would be the same as if the fuse had blown), there should have been the red light on. But it wasn't. Only the green light all winter. Charged up the battery and started the car but I think the battery froze so I will replace it. So just a word of caution - NOT ALL IS WHAT IT SEEMS TO BE! 
