iFixit

De-route the speaker cable from the left side of the battery case.

De-route the Wi-Fi antenna through its channel in the speaker assembly.

Lift the speaker assembly and push it forward until the ports clear the bottom side of the lower case.

Remove the speaker assembly from the rear panel assembly.

The battery is held to the rear panel by an excessive amount of adhesive. Proceed with patience and caution.

Use the flat end of a spudger to gently pry the battery up from the the lower case.

Gently continue to enlarge the gap by wiggling the spudger and running it along the right side of the battery.

Continue to pry until the right side of the battery is free from the rear panel.

Insert the flat end of a spudger under the top edge of the battery and continue to separate the adhesive.

Continue doing so until the top of the battery is free from the rear panel.

When there is enough clearance, use your hands to peel the battery off any adhesive still securing it to the rear panel.

Remove the battery from the rear panel.