Common symptom of a dying Battery/Alternator for an E53 X5

[Tymatk]

Hi all

I've searched the forums for symptom of a dying battery but i get bit of information here and there so im starting this thread with hopefully everyone here who has experienced a pre-dying stage of the battery on the X5 can have their Input here.

Mine: Not 100% sure if its the battery or the alternator

* Once every 2 months or less my battery Flat. I have to charge the battery up to be able to start it again.

* At the moment, car starts fine, lights work fine but GPS/Radio/TV won't work. Also indicator won't make any noise when activate (although lights are still flashing)