Oops wrong spot.
For those that cant afford to give their old lambo away when the keyfob dies...
Look at the front of the key, theres a little indentation. Use a small flat head screwdriver to pry the two halves apart.
It should pull apart like this:
You will be working with the part without the key blade. Stick your two thumbs in the channel the key Gallardo door is locked key battery went dead. How - theoverachie_1.jpgnd pull the lower half apart. 
Replace the battery and reassemble. The car will now need to relearn the key. Remove the plastic key hole cover by lifting the door handle slightly and pulling upwards. Once in the car, stick the key into the ignition and turn the car to on without starting it. Press the unlock button on the key fob. You should be good to go.
The key should go thru battery change and then u should be able to open the doors of ur lamborghini.
I had the same problem so i gave it to a friend and bought a new lambo
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On the door handle you have a little tiny Square section you need to use a small straightedge Pride between the edges from the front section of the door handle to the little square section for the door handle just to loosen it. It's been awhile since I had to use it but you have to pull it backwards and up to get it out I think
Then use the key on your fob same as ignition key and you can open it mechanically
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