No wonder fob batteries going quicker these days. Press once for drivers door, another for other doors, yet another for the boot. What ever was wrong with press once to open, press again to close.... Another example of car technology solving a problem that didn't exist.
Only if you've got those security measures turned on.... me I've got keyless set, it just opens all of the doors and the boot or just the boot if I walk up to the rear.
Its not the button pressing anyway, its the UWB ranging signal its pinging all of the time that kills it.
And on the Mk8 you do get a low bat warning, but only sometimes - not constantly, not even when its really struggling. Guess the mechanism it uses for determining it is a bit flakey. I've had it go flat several times with zero warnings at all.