What battery for bathroom scales is not a question you need to ask on this item because the Brabantia battery free bathroom scales do not require a battery as the scales use automatic power control. Pressing down on the start button with your foot generates sufficient power for weighing. Simply hold the start button down for a few seconds before stepping onto the scales. For a battery powered alternative, the Brabantia digital bathroom scales
take 4 x AAA batteries and other weighing scales are also available.