Ford C-MAX HYBRID 2018 Owner's Manual page 138

Unique Driving Characteristics
Question
How long will my high voltage battery last?
Does it need maintenance?
Can you charge the battery with a plug into
an A/C outlet?
Can I tow the hybrid behind my motor home
with all four wheels down?
C-MAX / C-MAX Hybrid (CCG) Canada/United States of America, enUSA, First Printing
The high voltage battery system is designed
to last the life of the vehicle and requires
no maintenance.
There are no provisions for charging the
high voltage battery from a power supply
external to the vehicle.
Yes. Your hybrid vehicle can be flat towed
without modification. See Towing (page
135
Answer
181).