This is very sad , but what else can you do when your Nike+iPod running sensor goes flat and you can’t change the battery?

I had to take a Dremel to it to get it open…

Only after the event did I find a page with a technical writeup (if you’re into that sort of thing).

I am still pretty annoyed that you have to spend £20 a year on replacing the thing. How hard could it have been to build in a watertight battery compartment?