Remove the four Tri-Point Y00 screws from the back panel of the Joy-Con.
Insert an opening pick into the seam at the bottom edge of the controller (opposite the L and ZL buttons).
Slowly slide the flat edge of your opening pick up the side of the Joy-Con.
With the charging rail facing away from you, open the the Joy-Con like a book.
Don’t try to fully remove the back panel yet. There are still two cables connecting the charging rail to the motherboard.
Use a spudger to gently pry the battery connector straight up from its socket on the motherboard. This will keep the Joy-Con from powering on during the repair.
Insert an opening pick between the battery and the Joy-Con housing.
Gently pry out the battery, which is lightly taped in place.
Be careful not to deform or puncture the battery—it can catch fire or explode if damaged.
Install the new battery
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