1 - Small Phillips head screwdriver
2 - New AA batteries
To replace the power meter batteries:
1. Open the battery door on the power meter by unscrewing the small screw that secures the battery compartment using a small Phillips screwdriver. After loosening the screw, the cover will hinge open.
2. Remove the batteries by rotating the crank into the downward position so that the batteries slide out.
3. Insert the 2 new batteries with the positive side facing the pedal end of the crank arm, as seen in the attached diagram.
4. Once both batteries are in place, secure the cover by tightening the screw.