Same here 2 months ago. Car was in for its second service plus software update, and a week or so before the low battery message came up on the dash a few times. Never thought anything of it as the message never appeared again. I assumed the garage had fitted a new one. (So like someone just mentioned, maybe the new software update does not have this feature anymore). The car just refused to open a week or so after we got it back. Tried spare set and exactly the same. Just as well had a couple of spare batteries.
MY17 First Edition - 3L Diesel Td6 - Farallon Black - Roof rails,side steps,tints,tow bar,mudflaps,door strips.
MY18 Hse Luxury - 3L Petrol Si6 Supercharged - Santorini Black - Roof rails,side steps,tints,tow bar,mudflaps,door strips,22's,dynamic pack 1,bonnet vents,t.v,dual view,frontcooler,360°camera,rear cooler/warmer,roof vane,black LR badges,wade sensing,door sill plates,boot liner, solar screen,wind deflectors,service plan,tracker,speed camera detector,dual dash cameras,ceramic coating.