The circuit board will be revealed, you will notice the various clips/wires that go to the speakers and the battery

Remove the blue "clip" from the mother board, then pull the on the speaker and remove it, to give you more room to work

Gently pull down on the largest bundle of wires connected to the mother board by a white clip.

Battery isn't anchored down, you will be able to pull it out of device

The battery can now be replaced