Hello
I have on two occasions recently lost time and date in my 2011, TDV8.
Once due to bad battery, second time was yesterday.
After driving 20 some miles and parked the car. When I got back to the car the clock showed 24 minutes (the same as the time I left it at the parkinglot) and date 01/01/2009.

Anybody has an idea of what causes this?
Is it the battery? Range Rover 5.0 SC AB 2013 L405 Orkney grey with Santorini black roof
Land Rover Defender 2.4 TD4 2007, Java black on black
Land Rover Series III 200 tdi 1974 black on black
Swedish LR club member #1961