ErlandsonR

I've noticed the same problem on my 2010 Fusion Hyb. (owned since June '09) It came on rather suddenly, starting in Oct. '18. Local dealer can't find any fault codes related to the EV function. I notice that high voltage battery takes and holds charge but can't supply enough power to drive the electric motor in EV mode. I also note it can assist the ICE mode. I wish there would be an high voltage battery health test roughly equivalent to ten one for the 12 V battery. Ford doesn't seem to have one as far as I can tell. Anyone have suggestions?