Done the stats and checked the temp with OBD

All seems ok

What's the IBS issue??

A common one that causes battery drain symptoms and sometimes a message on the idrive about excessive drain (IBS = Intelligent Battery System/Sensor, I think ((google 'E60 IBS'))). It's a weird one, car can sound like it's bearly turning over unplug the wire for it and leave it unplugged and starts normally. Also the battery cable in the book (on saloons anyway) had a recall (not in UK market like all BMW faults) where it's not passing the current from battery to engine properly with a weak point. (where cable leaves battery compartment and crossed under boot floor insulation forward of the spare wheel well and goes down through floor at a joint, that joint has an uprated part) 

Edited 27 January, 201511 yr by FUBAR

I phones bmw and the recall has been done on the cable, it doesn't sound like drain nessecarily very strange! I'm hoping not leak back seals on the injectors