Hello, I own a Ford Fusion 2010 Hybrid and have a question regarding its battery system. If the car is stored for an extended period, such as two months, and the high voltage (HV) battery runs out of charge, will I still be able to start the engine? I understand that the 12V battery can be charged or boosted with a jumper, but I'm curious about the HV battery's role in starting the vehicle when it's completely discharged. Can the car still be started in such a scenario? Thank you for any insights you can provide on this matter.

 

You should be able to start the gas engine, but may not ave sufficient power in the high voltage battery to utilize driving the vehicle until is running a while and recharging the larger battery.
If the large battery is original, you may want to be sitting down when you find what replacing the larger battery might cost.