Remove battery type plate – sticker. Remove the sticker carefully that you don't damage it and you can glue it back.

Remove four rubber plugs using sharp object.

Remove the four Phillips head screws under the rubber plugs.

Remove the plastic battery end.

Attach the battery lock using the four Phillips head screws. Then cover the screw holes with rubber plugs. Replace the bigger rubber plugs with the plugs you will receive with the battery lock. ( Picture below )

Once you have screwed the battery lock in place, clip the battery type plate back.