FORD 2014 Focus Electric - Manual (Page 236)

LOW AND HIGH VOLTAGE BATTERY STORAGE
If your vehicle is to be stored for 30 days or longer, the high voltage
battery should be charged to above 25% state of charge and the low
voltage (under hood) battery negative terminal should be disconnected.
If your vehicle is to be stored for 3 months or longer, the high voltage
battery should be charged to between 80% and 100% state of charge and
the low voltage (under hood) battery negative terminal should be
disconnected. Failure to do this could damage the batteries.
Note: If battery cables are disconnected, it will be necessary to reset
memory features.
Vehicle Care 235
2014 Focus Electric Vehicle (fob)
Owners Guide gf, 1st Printing, May 2013
USA (fus)