[sonick]

Originally Posted by snowfarmer

If you suspect your battery, go get a multimeter for $10-$20 and test it. cheaper than a new battery and if you wrench on cars and ever need to chase electrical issues you definitely should have a multimeter. It's not a tool you need every day but will pay for itself many times over if you have one.

Did you throw a code reader on it to see if there are any codes?

No I haven't done either yet, but good call.

Is the battery voltage on BMW's similar to other cars? i.e. 12.6v range?

I have a generic OBD2 reader not BMW specific (Carly), wasn't sure if it would register codes for radio issues, figured it was just engine codes, but I'll give it a try.