Lift the battery cover off from the Battery Compartment Release slot on the bottom of the handset.
Remove the battery by lifting from the slot at the bottom of the battery.
Clean any debris off the gold contacts on both the battery and the handset.
Note: To clean the contacts it is recommended to use a soft cloth.
To re-insert the battery, place the top of the battery in the compartment, ensuring the triangles on the battery point to the terminals at the top of the handset, and then press the bottom of the battery into place.
Reattach the battery cover.