Locate the following:

Two negative battery terminals.

Two negative battery wire glue-points.

This glue may separate from the motherboard while detaching the battery terminals, but this has no significant impact on the device.

Gluing any separated wires back to the motherboard is an optional reassembly step.

One terminal at a time, pinch the battery side of the terminal towards the wire side of the terminal with a finger or thumb, and pull upwards away from the front cover to release the terminal from the cover.

The negative battery terminals require much less force to remove than the positive battery terminals.