That's better than nothing, but that doesn't describe "NFC works with dead phone", that describes "phone reserves up to five hours of emergency battery power for only NFC use".
When my current car fob starts displaying a low battery warning I have at minimum weeks to replace the battery. (Not to mention my current car fob is resistant to being dropped, stepped on, etc.)
I've never had my phone die more than 5 hours before needing to drive. I have had my fob stop working without warning. So this would be a good improvement for me.
When my current car fob starts displaying a low battery warning I have at minimum weeks to replace the battery. (Not to mention my current car fob is resistant to being dropped, stepped on, etc.)