Using your fingers, press down firmly on the plastic slide and push in the direction of the arrows shown above the word "Open" on the plastic.

Remove the plastic slide from its location and set it aside.

Remove all 4 AA batteries by placing your fingernail at one end of the battery and applying force upwards until the battery is freed from its holder.

Insert your fingernail or a prying tool under the notch of the plastic slide that is protecting the watch battery.

Set the plastic covering and the watch battery aside.