« Reply #11 on: 03 February 2015, 16:50 »
It stands to reason that any car with keyless is going to be a lot harder on the keyfob battery. It has to do that bit more work than a non-keyless equipped car. Ever look at your keyfob as you press the START button? The little red LED light flashes on the fob. I'm guessing there's a fair bit of 2 way wireless communication going on between the key and the ECU to ensure that the correct key is inside the car!
No but I must have a look now, even leave the car running and walk round to open the garage door with the key in the pocket, so I wonder if things like that have an impact.

Logged
Diagonally parked in a parallel universe.
On Order: Mk8 R, Pure White, Reversing Camera, Harmon Kardon, Heated seats all round.
Gone: Mk7.5 R, 5dr, DSG, Deep Pearl Black, 18” Cadiz, Nav, Winter Pack, Keyless, Dynaudio and Reversing camera.
Gone: Mk7 R, 5dr, DSG, Limestone Grey, 19" Pretoria's, Nav Pro, DCC, Winter Pack, Keyless, Mobile Prep and Reversing Camera.
Gone: Mk6 GTD, 5dr, Manual, Tornado Red, 18" Vancouvers, RCD510 + Dynaudio, heated seats.