What number battery is Xiaomi electronic scale?

I feel good when I get the Xiaomi electronic scale. It uses the No.5 battery, which is quite convenient.

Because the surface is made of glass, when you step on it, it's cool to scratch your feet. In summer, I'm still busy, but in winter, don't I have to lose weight in winter? The accuracy of the electronic scale is quite accurate, but I have never used other electronic scales, so there is nothing to compare. The maximum error is a few grams, nobody cares!