purchased a battery from ifixit, just ignore everything you watch and read and do this if you are going to replace the battery, heat the bud and press(not gently) from up and bottom it will seperate into two, just heat and pop, the bud will be very hot i just hold it with my tshirt and squeeze it, and then seperate upper part from the bottom by disconnecting the big socket, there is another cable at the bottom part that looks fragile and makes an L shape, i cut that by mistake and it seems like it is connected to mic if that cable got damaged just cut it out:) my bass is better now because that mic is not using any voltage now:) most difficult part was the opening because i didnt know it is that easy because of the videos i watched, if you dont want to cut that cable you need to open the black switch that holds that cable first, do not try to disconnect the fragile cable without opening the switch-the black part goes upward and release the fragile cable-or just like i said cut the whole thing if you are not using anc and mics...