I thought the battery drainage problem was fixed in July, after several occasions when the battery had completely drained over-night. The solution was supposedly a software change that was directed by a Ford engineer to the hybrid technician at Show Low Ford. Anyway, the vehicle had no electrical problems since that "fix" until today, when the battery was once again completely drained during a 14 hour period when undriven. Roadside Assistance had difficulty jump-starting the vehicle, but it eventually started and was driven to Oracle Ford, the dealership where it was purchased in February.
We'll see what happens with a different service department, but it's beginning to look like I may have to pursue Arizona's "Lemon Law" concerning this C-Max, which I really like in all other ways.
If any other C-Max owners are still experiencing low voltage battery failure, please respond. Apparently, the software "fix" that was applied to my vehicle was not the solution to the problem.
Edited by jchaddpete, 03 October 2013 - 07:09 PM.