Charging battery in service mode?

Hal Adams

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Has anyone done this? And if so, any problems?

I wish to put the car into service mode - opening the rear EPB - with an issue in that it will have to stay this way for maybe a couple of days (normally to change rear pads, I just open the EPB on the battery as it is only 5 mins..). However, this time on connecting the battery charger, there is quite a loud noise from the B&O base module in the boot..!

Anyone any idea what and why??