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This topic is for discussion of charging efficiency, that is, the total energy needed to charge versus that used to run the car (energy out of the battery).

I guess it makes sense but apparently the C-Max is programmed to not charge the HVB in neutral even with low SOC. I had started up but was waiting in the driveway - ICE had started since SOC was low (EV+) - and noticed HVB discharging. Shift to forward, reverse or park and it would charge. Shift to neutral and it would discharge. So, neutral really means 'no load on the ICE' as it would with a conventional drive train. I wonder what would happen if you sat there a long time? Hopefully its programmed to start charging at some point!

Did 'some' putzing around with the lights for a couple hours. Then drove the car in EV mode for 20 minutes. My wife may have driven in EV only mode for past 2 or 3 days. Got to destination, got out of car. closed door and heard a double honk TWO fast honks - Beep Beep. tried a few doors, all doors gave same double honk (perhaps car was still 'running'), not sure. came back out after maybe 30 minutes in store. Battery Dead, needed jump. So, question is whether A) how'd I kill the battery and B) if it was cumulative wear on battery, is the lesson learned that owers need to drive in non-EV mode at least a few miles every week to charge the 12V battery. or C) do I have a bad battery or charging system that isn't charging the battery properly.

Hi there! I just came home with my 2015 hybrid last night. Upon driving it, I notice that it will tell me brake check/charge 100% complete but the little battery is never 100% full. It is only 3/4 full. Does it ever get full on the symbol? Thanks for your help!

The 2nd replaced, about a year and a half ago, 12V battery on my CMAX is probably not getting charged even after driving on highway for 50mins to 1hour recenlty: 01/20/2015 11:15AM, after parked the car for 3 hours after hi-way driving 1hour, turned the key to ignition postion 1 to get the radio playing. After 3mins, the radio shutoff, turned the key to ignition postion 3, the "low battery..." message appeared. Turned the car off, and turned the key to postion 1 again, 1 to 2 minus later the radio turned off again. Turned the car on, the "low battery" appeared again. This time I left the key at position 3 for 10mins, hopefully the 12V get charge. 01/21/2015 7:40AM, right after hi-way driving for about 50mins, parked the car, removed the key, radio still playing (have not open the door yet). After 1min, the "low battery" appeared but the screen immediately shutoff. Turned the key to position 3, and there it was the "low battery" appeared again. For each time, I got into and looked at the ET screen for the 12V voltage. If key was at postion 2, the 12V had 12.4Volt constantly. And when I turned the key to postion 3, it showed between 14.3 and 14.4 (flickering between those 14.3 and 14.4). I could have radio on for 20mins or more when key is at postion 1 or 10mins when the key is taken out before I open the driver door. The "low battery" happened from time to time before but never in twice in a row like the above. There were times I saw the "low battery" message and the radio was auto-shutoff. But immediately after that, took out the key, turned the key to position 3 and back to position 1: no "low battery" for 20mins or more until I shut the car off and opened the door. There were also times I saw the "low battery" message on the previous days. And after driving 1 to 2 hours, parked the car for 3 to 4 hour, and then the key to postion 1 and the radio play for 50mins or more before I turned off the car and locked the car. It is probably whatever computer component controlling the 12V battery charging or reading has gone haywire. Or it has always been like this, I do not know. Or the 12V battery is in need of another replacement, but then that replacement get no charging as it is always supposed to. Or another problem adding to the unknown phanthom discharge that still not sovled by Ford.