https://wccftech.com/2021-macbook-pro-teardown-battery-and-ports-replacement-easy/

Shortly after we posted about the 16.2-inch M1 Max MacBook Pro disassembly, a fresh teardown of the smaller 14.2-inch model has surfaced. The person who gained access to its innards noticed some changes Apple has made to make some parts easy replaceable, and others, not so much.

According to the_Ex_Lurker on Reddit, Apple has made some changes to how authorized personnel can replace the affected components on the 14.2-inch MacBook Pro. We are assuming the same changes will be carried to the larger 16.2-inch variant, such as easily replaceable batteries, which now feature iPhone-style pull tabs instead of being glued on the previous models. Down the road, if you feel that your MacBook Pro is not delivering the same battery endurance, switching it with a new one should not be difficult.