Fingerprint locks generally have two power supply methods: One uses four AA alkaline batteries, which typically last about a year; the other uses two circuit systems, one with four AA batteries each-one for fingerprint and one for the password-and typically lasts about a year and a half (the exact timeframe varies depending on features, power consumption design, and usage frequency).
According to industry standards, anti-theft fingerprint locks should be equipped with an additional emergency power supply interface, which can be powered externally using 9V battery packs.
