You can use Nanfu batteries, but the millet door lock can not use ordinary Nanfu batteries. Buy leak-proof batteries so they don't spoil the locks. It is recommended to use the smart door lock special Nanfu i master battery, more safe.
Fingerprint combination lock generally uses 4 5 alkaline batteries. Generally, it can be used for about one year (depending on the function, power consumption design, the number of uses, etc.). According to industry standards, the production of anti-theft fingerprint lock should be equipped with an emergency power supply interface, which can be externally supplied with 9V laminated batteries.
Millet smart lock can use Nanfu battery, because the voltage of Nanfu battery is 1.5V, millet smart lock. You can use dry batteries, but the millet smart lock can not use rechargeable batteries, because the rechargeable battery voltage is relatively low, which will affect the normal use of millet applications, so I think the millet smart lock can use two pairs of batteries.
Yes, Nanfu batteries are available in various models.