The RFID credit card 'backup' key is just that-- a backup. It's batteryless. It's not supposed to remain in your pocket. It's supposed to ONLY be used for, say,

The RFID credit card 'backup' key is just that-- a backup. It's batteryless. It's not supposed to remain in your pocket. It's supposed to ONLY be used for, say, a valet, or if your phone key fails. The phone key works flawlessly in my experience, and is better than the fob-based system, in my opinion. (see the rest of the thread for more detail if you're not familiar with it).