3x1.5V AAA - not Mignon, the smaller ones. After about one and a half years, the display is still as bright as ever with the first batteries supplied. The scale seems very accurate to me, even in multiple comparisons with calibrated scales at the doctor's office. In addition, it is robust and has a large base - top.

I find the large display very good! My scale works perfectly and accurately. I would buy it again

I think AA. The scale is a disaster. Not very accurate.