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1. The battery compartment is located under the interior latch, secured by four Philips head screws, one at each corner. 
2. Remove all 4 screws while carefully holding on to the back of the lock so it doesn't fall. 
   1. This is most easily done with the door closed. 
   2. When you do this, you are locking yourself in the room. Don't freak out.
3. The piece you are removing will look like this.

Image Added

1. The piece you are removing will have a square hole that should have a peg with a spring on it. The peg will fall Some of the doors are missing the spring.

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