1.) Unlock the Padlock E and pull the shackle to open position.
2.) Turn Torx cap clockwise 120° with the Torx screwdriver & push battery cover out.
3.) Replace the CR2 battery, close the battery cover and turn Torx cap counter-clockwise 120°.
4.) Push the shackle to close position to lock it via Auto Lock or manual relock.
Ensure that you align the battery markings as not doing so will result to damaging of your padlock E!.