Xiaomi doorbell 2 battery needs to use a special battery, can not use Nanfu battery. Because the battery design of millet doorbell 2 is more special, it needs the support of charging and battery protection chip, and the use of non-dedicated batteries may have safety problems such as incompatibility and overheating, and will also affect the use of doorbell. Therefore, it is recommended that users choose original batteries or certified special batteries when replacing the battery to ensure the safe and stable operation of the doorbell.