I posted a couple of weeks ago that the low battery indicator was warning me that my battery was close to experition. Last night it expired. So, I decided to change the battery myself.
T6 Torx driver
Spring bar tool
The watch with the low battery indicator in the upper left.
I did this work on my kitchen counter so I laid down a cloth to use as my work station. Then I placed my watch, tools, and battery on it and got to work.
The first step is to use the Torx driver to remove the 4 caseback screws. Mine were installed snugly, but removed quite easily.
Then, in order to ease access, use the spring bar tool to remove the leather strap.
The next step is to use the paper clip to assist in removing the caseback. Open up one end of the clip and insert it in the gap between the caseback arms and the lugs, opposite from the sensor. Apply a small amount of upward pressure and the caseback easily pops loose.
Here is a closeup shot with the caseback removed. Note the length of the strap that connects the air pressure sensor and the other internal electronics.
Now insert the new battery and reverse the removal procedures to put everything back together. Ensure that the strap is positioned fully flat inside the case and the the caseback O ring is seated properly. Now reset the time, date, and elevation. Here is my watch after reassembly.
After changing the battery I realized that it probably wasn't neccesary to remove the strap. But, it did make it easier to maneuver the watch.
I hope this helps others out when their battery expires on their Elementum. All in all, it went easier than I thought that it would.