Precision Maintenance Kit

It just popped off unnoticed by me one day. I’m glad they sell that part. I now put a piece of tape over the cover so I hopefully won’t loose another one.

Took out the battery and tried putting back the cover with a new battery in, but it won't lock anymore:(

I lost the cap to my power meter. Apparently that is not completely uncommon because they sell a replacement in the form of the maintenance kit. It got here quickly and it worked. I got my power back, as it were.

Had to get another cover it works

The power meter on my non-drive side Ultegra crank stopped functioning out of nowhere after less than 18 mos of use and a message to 4iiii customer support provided immediate troubleshooting suggestions. When those did not remedy things, with no further questions asked 4iiii made offer of sending a reconditioned power meter/crank arm reconditioned which I gladly accepted and it is working great. Amazing customer service!