Fob dead locked out? What if?

28 minutes ago, Cqrmine said:

we have a Mercedes 62 reg C180 with 20,000 miles showing and the key fobs have never been changed.

Could they have been changed as part of a service? Even if the Merc doesn't have kessy, 14 years from a single battery seems a stretch. Unless they're rechargeable?

I had a 3 Series where the battery in the fob recharged wirelessly while driving. The car died after 15 years but the key was still going strong.

Edited 31 minutes ago31 min by Rbz5416