It won't be a new battery required. The message is telling you something is draining the battery when the car is shut down. The E60/61 does this when certain modules fail to shut down correctly when the car is locked, they then keep draining the battery causing the same message. On that model the comfort access system on both versions and the rear tailgate modules in the e61 used to cause the fault when they failed.
As its a relatively new model it could be something different failing, do you have anything on the car that isnt quite functioning correctly or any aftermarket stereo or amps fitted?
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