Looks like you discovered the Anything goes thread. Deffo took a wrong turn there :). That should really be called the Take the p1ss thread but now you have the right section you should get sensible answers.
The 2010 is a bit newer than mine but...
I've just changed battery on my P38 as battery not holding charge was causing all sorts of electrical faults with different systems when running. Biggest powerfullest battery you can get and that will fit in battery tray recommended
When we leave it with the smart charger over night, it doesn't happen and then we you put a jump pack on it, fires up and keeps running. It's a bit odd as it initially fires up and cuts out straight away
Trying a different thread as less than helpful comments on the general thread....
Hi Everyone, we have an L322 2010, tdv8 with an odd battery drain, press the start button fires up then instantly cuts out.
Battery is good
Alternator is charging...