Removing Battery Cover

The battery cover is located on the backside of the timer.
Slotted button style covers: turn the round slotted plastic cap one-quarter turn with a coin or screwdriver. Lift back off timer. Remove batteries and discard. Replace with new batteries Replace back cover, turning plastic cap one-quarter turn to secure.

Slide style covers: slide cover off in direction of arrows. Remove batteries and discard. Replace with new batteries. Replace cover by positioning tabs into slots and sliding cover in place.

How do I remove the battery cover to replace the battery?