"Trackpad erratic and jumping around" için yanıtI found an interim solution that could help for the short term. If you find that your Mac is “rocking” on the desk, try putting some supports under the feet so that the body isn't in contact with your desk. I put a couple of strips of glass under the feet on both sides, which raised the underside a few millimeters. This seems to release the pressure from underneath and takes care of the erratic mouse issue. This should just be a solution to tie you over until you can get the swelling battery replaced.