you dont replace the battery at all you just fix your broken one but if you are lazy just look o ebay yuo should find a matching one
lol, that was 2 months ago
I already fixed it, I bought a replacement battery off of ebay for $8 (free shipping) and replaced it
but also the way it says to open it actually damaged the headset so it doesn't close all the way
"Look at the back of your Mic where you plug the Charging Cable in, jam a screw driver (Flat Knife its even better) in between the gap and force it open."
that ended up cracking the plastic around the part the charging cable covered and I had to open it a different way
and something else happened (Im not sure what) but its not as clear as these mics are supposed to be and people are higher pitched and sound more electronic through, but after several hours they sound normal like it just needed to warm up
and within this past month I now need to stand up the mic by leaning it against something to be able to charge it