Needed a Battery, wanted OEM, went to iFixIt!
10 - 45 мин.
A bulging battery makes for difficult TrackPad clickery.
Very easy. Ten screws to remove the bottom case cover and three more to remove the battery. Unplug the battery and replace with new.
Shutdown the system first, obv. Also, be sure to have the unique screwdriver for the battery screws.