Ford claims the HVB does not require any maintenance and will last for the entire lifetime of the vehicle. OK, fine. But what exactly does that mean? Five years? Eight years? Ten years? Properly maintained cars can live for decades, and I'm sure no battery in the world will last that long.
In Europe the hybrid is pretty new; we can only take the manufacturer's word for it. But in the US Ford has been selling hybrids for quite some time now, so we should be able to get some real life data already.
What's the oldest hybrid Fusion you know of, which still has the original HV battery? Has any of you had his or her Fusion long enough to need to replace the HV battery?
How do you know when it's time to replace it? What are the symptoms?