maybe
does your door open with the fob?? if not is the battery. but
I had a similar issue when I purchased my a8 exactly following day I drove it home.
I was fiddling with a scan tool and radio was on, so I finished get off the car locked it with the fob, had lunch came back to the car to go for a ride but car did not open with fob..OMG so I tried unlocking it and after about 3-4 min pressing the fob, the car has opened. Sat in the car put the key into the ignition light came on, MMI tilted up radio started playing but no crank on the key turn.I hooked up jump leads to the car(other cars on 2000rpm for about 2-3 min to give a good boost to my a8) then I started A8...to avoid getting stuck somewhere I purchased a new battery and no problem since then..
BTW I don't think MMI battery level is any accurate as the battery gets to 100% in less than 4min..
BTW2 you can check the battery condition via VCDS.
as the other members said to hook up another battery with similar capacity and to see if there is something else wrong.
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