I have a 2006 Ford Hybrid with approximately 80K miles, never had any problems until recently. About a month ago, I didn't drive the car for about 3 days straight, it sat in the garage. When i went to drive it, it wouldn't start as if the battery was dead. So we took it in and $200 later got a new battery (not the electric battery, the regular battery). This past week, the same thing, I didn't drive it over the Christmas holiday for 3 days and when I went to get in, it wouldn't start, turn-over or anything. Can't be the battery, that was just replaced. We jumped it anyway and that worked, but is there another underlying problem that is zapping my battery? I did notice that as the car sat in the garage all weekend, it would make a clicking battery fan noise every so often.
I have the same problem with my 2007 Escape Hybrid... First experienced it about 1 year ago. The vehicle produces periodic sounds like an electric motor running for several seconds. I believe this is from the motor driven safety relay that disconnects and reconnects the high voltage hybrid battery when the vehicle is not in use. I also can hear a high frequency scream that sounds like a switching inverter power supply. If the vehicle is unused for a day or two the 12V battery is discharged and a jump is needed to start the engine. Ford service could not diagnose the problem. The +12V battery tested OK, but since it was almost 3 years old it was replaced anyway. This helped for a while, but the problem returned after I recently left the vehicle unused for several days. I know the battery is good, it tests OK and is less than one year old! Somewhat reluctant to go back to the same Ford service agency because of their previous failure to fix it. Please advise if you have found a solution or have additional information. This is the only problem I have ever had with the hybrid Escape, but it is very annoying. I am forced to carry a jumper battery to make sure I don't get stranded.
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