Charging the C-max battery for 3 or 30 minutes after jumping another vehicle will add little charge to the C-Max battery. Also, modules have transient protection built into them (assume Ford follows standards) including reverse polarity, jump start, load dump, cranking, and so forth based on ISO and other standards.

Ford C-Max Alternator Diagnosis . 2. Voltage Regulator. The voltage regulator ensures that a certain level of voltage passes to the charging system to keep it from overloading. It can keep too much voltage from passing and throw P0562. 3. Battery Wiring. There’s a lot of wiring associated with your C-Max’s charging system.
The C-Max Energi often has its battery fully charged daily, and rack up 15,000 potential charges to reach 300k miles. Of course, it's not often people charge it up twice in one day, so that would take 41 years, but I've certainly charged it fully twice in one day, sometimes 3 times. I don't know how / when the Battery Management System adjusts SOC but it has to do such periodically to compensate for "drift" of the calculation methods it uses. As far as cell balancing, the BMS, when required, equalizes the charge of the 76 cells that make up the HVB by draining charge from the cells with the highest voltage. This will
Ford C-Max Specs for Other Model Years enhanced voice recognition, 911 Assist, 4.2" LCD screen in center stack, AppLink and 1 smart-charging USB port Tachometer, Traction Battery Level
Except Ford didn't make this charger. A 3rd party company did. Ford just put it's logo on it. Also, if you ever charge outside of home, you're using 3rd party charger. Ford should have done what most other manufacturers do and simply provide a convenience cord, as they already do and a recommendation for a wall charger.
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ford c max battery charge