Here's what worked for me.

1) I followed all of the instructions above

2) I simply unplugged the battery,

3) plugged in the electrical charger cord

4) powered on the Jambox. it worked just fine

5) powered it off,

6) plugged the battery back in (white and red wires) and let it charge

7) put the jambox back together

Here's a tip that helped me get the adhesive tape out. Take your time on the tape. It runs the length of the battery. If it breaks you can use the ifixit tweezers to grab the edge of the tape and start pulling on it again. Once both pieces of tape come out the battery easily comes out. If at any point when using the credit card to remove the battery if you can grab the tape with tweezers, go for it and it will save you lots of time and hassle.