My Nike+ sensor recently died and after looking around the web I found that they wanted $20 to replace it! So instead, contrary to what others on the web seemed to say, I took it apart and found the process very simple and it only took 10-15 min. and a $4 dollar battery.
Pliers (optional, but handy)
Small philips screwdriver
Crazy glue (also optional, but handy :-) )
Please feel free to comment and rate! I'd love to hear your input!
Step 1: Disassemble the Chip
Use your knife to pry apart the side of the chip. Then use a small screwdriver to remove the 2 screws on the top.
Step 2: Remove the - and + Ends
For this part I also started by using the knife to pry up the connection on either side of the battery, although in the end I had to use the pliers to get the rest of it off. You can throw away the clear sticky plastic that comes off first. Then proceed to do the same for the top. Just in case, I saved the black strips from the top and reinstalled them on the new battery.
Step 3: Attach the New Battery
Now attach the new battery just like the old one was attached making sure to put the - and + terminals on the correct sides, add a little electrical tape to secure it all in, put in the screws and put the top on. Then use a little super glue around the edges and your good to go!
Let me know if I missed anything, and please rate!
NOTE: Thanks to manubx for fixing the low battery screen on iPhones and iPod Touches! Check it out at www.instructables.com/id/Nike-sensor-battery-replacement-get-rid-of-the-Lo/