Steps to remove the battery from Bose soundlink: - Firstly remove the two screws at the downside of the battery by using a 2.5 mm hex wrench. - Move up on the back of the cover when it slides up - Move the cover-up away from the Bose soundlink speaker's back.  - Remove the screws near the bottom side of the speaker to protect the battery. - Extract the battery straight out of the speaker. Steps to attach a new battery in Bose soundlink - Restore the screws in the battery and tighten it by using a 2.5 mm hex wrench. - Place holes inside the cover on the back side of the speaker with anchor posts and push the body into the place. - Move the cover down on the anchor screws until it ceases  - Restore and tighten the screws with a 2.5 mm hex wrench at the bottom of the body.