I’m having intermittent charging issues on a 2010 35d.

New battery fitted and registered. After starting the car the battery current measurement at ibs is around 30a discharge (measured with bimmerlink and verified with clamp meter).

If I disconnect the battery and reconnect it then restart the engine the battery shows it’s charging fine. Leave overnight and I’m back to not charging.

I do get an error 4A56: 4A56 power management battery (Layer_PMBATT)

Anybody got some ideas on where the fault lies l?

Thanks in advance