How do I replace the batteries on my AvaPeak?

AvaPeak consists of two battery packs. Each battery pack consists of two batteries.

Replace the discharged battery pack with a new one.
Press the display button to turn on the display.
Press the display and right arrow simultaneously to access the menu.
Choose the menu ”battery replacement” by pressing the right arrow key and then press either the up or down button to reset the battery life of the battery pack in question.