When you disconnected the old battery it reset the computers. The dsc computer needs you to reinitialize it by this:
Start engine.
Turn wheel all the way to right,
Then turn wheel all the way to left.

Acknowledge the errors in idrive etc, they should be gone by the next restart of engine.

Just saying this because a year ago I changed from factory agm to a lead acid battery and that's what cleared the errors. It was a week later that I was able to recode to 90ah lead acid. The not coding is not what causes the errors! But what did do it was swapping the battery , disconnecting power makes modern bmw's go crazy.