before you begin make sure you have a t2 star screwdriver and hear a drier or something to heat up the battery from top so it will come off easier.

if you in usa you can get one from micro center called Mako Precision bit set it about 38$

but if you just want to do this job you can get from online for about 3$. and one prier flatspudger like the plastic one they sail here

and one tweezer. Without these tools, you cant complete job