My 2008 Q7 keyfob no longer started the car but buttons unlocked & locked it. I went to auto locksmith who made a fob that started the car but he couldnt get it to unlock & lock with buttons. After a day the car dashboard said low battery please drive to charge and mmi showed like 50%.
I drove it and it showed 100%.
Today i went to start car and was dead. Checked mmi and showed at 10% and had to get aa to jump it. Drove again and its 100% now.

This only started after a new keyfob was made. Why would that be draining the car battery?? Never had issue ever before and certaintly not 90% battery loss after 2 days. Anyone had this or know why this would happen??

the key man did hook up a battery charger when doing the key but it kept beeping so i dont even know if it was connected

The chances are that your 12 volt battery is almost dead and needs to be replaced. The locking problem was likely a symptom of the defective battery, not a cause. I recommend you get the battery tested, and if it needs to be renewed get the new one coded to the car.

Only like 2&1/2 years old. Halfords coming out to check it as has 5 year guarantee. Cant gone bad that quick

Yes it can if it has been allowed to go flat or was not coded to the car when fitted. A proper battery test should reveal the truth of the matter.

What was the result of Halfords visit? Did they test the battery?

I didnt respond to this and now had a warning. Utter joke. 

The former member who called himself Borat has had a hissy fit and departed the forum.