I have a 2012 Fusion Hybrid. The red lock symbol that flashes in lower right of display when the car is off, is the security or alarm. Sounds like your regular battery is dead. You need to go to a Ford Dealer because noone makes that size battery anymore except Ford (Motorcraft). It needs to be small due to all the hybrid components and space issues, and it has to be powerful too because it also starts your hybrid engine. I got one at a dealer for $120 and it comes with a 8 year warranty.
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