There are other threads that cover the drainage issue with the battery. It appears that because of the electronics that they do drain after a few weeks. Some have had them go longer by shutting off the radio and fan before parking the car. But the solution is to disconnect the battery and install a battery tender (I prefer the battery tneder jr). This will maintain the charge of the battery. (I also recommend gas stabilizer if the car is being stored for over a month). The manual state to disconnect the negative terminal if the car is being stored.
Items that are normal maintenance items (like the battery and tires) are not covered by the manufacturer warranty. Maybe the battery has its own warranty. You can ask the Ford dealer about this.
Items that are normal maintenance items (like the battery and tires) are not covered by the manufacturer warranty. Maybe the battery has its own warranty. You can ask the Ford dealer about this.