F.Y.I. Jay0555, I'm with MrSticker's reply regarding the battery. Besides, you break vehicle ownership tradition, if something else does not need tending to after you fix the part that did.
On the 2015's and newer, so not sure about your 2011, if you replace the battery with a new one, don't forget to reset the battery monitoring system. You typically cant see what is up with it unless you have a scan tool, ELM327 Bluetooth thingy, and software to read and clear fault codes, real time PID reporting, run KOEO and KOER tests, etc. It reads the PID's assigned to the ECM's diagnostic programming code telling you; How long the existing battery has been in the vehicle. What the batteries charge level is. What the, not sure about my wording here, but what the loaded charge state of the battery is. Amount of electricity flowing to the battery from the vehicles generator (2016's), or perhaps alternator if that is what yours has. What the batteries temperature is, etc. Ford technicians know to do this, basically set the battery in service days to 0 when they install a new one, that resets the BMS. AutoZone, Walmart, Advance, quick lube places, etc., don't, mainly because they did not know about this, or they neglected to inform the service person installing the new battery, they did not get the memo, what ever. I was dumb as a duck about it until I replaced the factory 4 year old, actually to the day almost, AutoZone replaced it and sent me on my way. Because I am a **** retentive person, I did not like the 1,400+ still increasing day by day in service days FMCO battery, kept showing up in my CarBit monitoring software. Leaving the vehicle locked, the proximity key well out of range of the vehicle, for 8 plus hours doesn't work either. Plugging, "0", in the reporting PID's 1,400+ day value doesn't work either. Forscan software, a very good OBD-II adapter - ELM327 scan tool, or your local Ford dealer service department, you can do it yourself or they can.
Why this is so important, and necessary for vehicles equipped with the BMS programming, that it must be done with a new battery installation. As batteries age they place more demand on the vehicles charging components. Ford ECM's and the related BMS programming keep up with this subtle over time increasing demand. The system adjusts, for example, the charging output of the vehicles generator in my case, to accommodate the batteries age and demand. That is the quick explanation from my dealerships service department. That said, when AutoZone replaced my old battery, my vehicles generator was sending 13.8 - 14.7 volts to charge the battery. Once and a while that would actually increase briefly to 15.1 volts long enough to generate a charging system fault code for scanning equipment to pick up on, and does not trip the idiot light, "Check Engine Light," on the dash. The fault code gives Ford technicians a heads up about a pending issue when you run the vehicle through a Ford Service bay for the regular oil change or other simple service. Nope, they are not trying to stick you with a new battery purchase, if that pops up at your next vehicle service. When the new battery gets put in, the charging system still sends the 13.8 - 14.7 volts to the new battery when it only needs 12.5 - 13.5 volts to stay charged up, and only needs the higher charge rate under load, or if you forget to turn things off, or unplug the ice chest in the back, when you shut off the ignition, (temporary demand vs. sustained demand). So, not resetting the BMS to 0 if so equipped, means at the very least, premature failure of the new battery due to overcharging/oversupply, or worse, replacement of the vehicle generator - alternator as sending too much juice to a new battery can cause them to overheat and eventually fail. It's how Ford explained it to me, since I have the equipment to mess with it, I reset the system myself. Best of luck fixing your other problem. If I cant clear it, reprogram it, or reset it, I have to let Ford fix it. I'm too old for messing around under the hood too much, or under the vehicle at all. God, I would never get up off the ground!
