Have you had reported electronics malfunctions reported - like battery issues? on 2008 BMW 535xi

have had used car for about 1.5 years and now on the 2nd time of total electrical failure. they replaced battery in oct'11 but same thing happened this time. the 'servictronic malfunction' message comes on when holding down the 'check' lever.

Asked by for the 2008 BMW 535xi