Interesting.  I pulled out two 2025's out of each fob.  And replaced them with 2025's.  One went easy, and the batteries fit right in.  The other one did have a little trouble holding the top battery, but both fobs work just fine now.  Maybe the 2016 used the 2025??  I don't know, but they both work now.

My 2017 Sport also uses the CR2450

The Edge FOB takes CR2450 batteries.  they are 24mm diameter and 5mm thick The CR2025 is 20mm diameter and 2.5mm thick. Two of those can work in a pinch, but the diameter can be an issue. 

Yes, it protects the radar from debris and damage.

they appear to be metallic on my 2016. try a 5.5 mm socket wrench.

does everyone with adaptive cruise have the lower grill covering the radar or is it open? 

You have no idea how much I appreciate this forum and appreciate you. This community is a lifesaver. 💗

I got a message today, after my Edge wouldn't remote start, that the battery in the fob was low.  Yeah, so low, it wouldn't remote start.  I could still unlock the door though.  Got the other fob, and as I figured, it was dead also.  Luckily, I had some CR-2025 batteries at the house.  Of course I didn't know that each fob took two batteries.  Dang.  And man, getting the cover off was a test of patience.  If I had to get to the emergency key for something real, I think I might have broken the thing.  After it broke my fingernails!!  Anyway, I finally got them apart, changed the batteries, and all is good.  Now to get the second TPMS sensor replaced.  It's close to oil change time, so I might just wait until that comes up, or just get the oil change done a little early, and have the TPMS done at the same time.  It's all good!

Welcome.   What type things does your Edge need doing?

Hi all, I'm new here from Lubec ME. I've been a lurker who only visit the site whenever i need things done with my ford edge 2010. But I've decided to be a full member and to connect with fellow enthusiast. I'm welcome to learn more about my car and to share ideas if needed. Thank you all!