Safety Notice; Built-In Battery Precautions - Xiaomi Mi Band 2 User Manual

Safety Notice

Do not attempt to force open the sensor. Substances contained in this
product and/or its battery may damage the environment and/or human
health if handled and disposed of improperly.
Do not attempt to disassemble your Mi Band.
Do not expose your Mi Band to extremely high or low temperatures.
Do not leave your Mi Band in direct sunlight for extended periods of time.
Do not use your Mi Band in a sauna or steam room.

Built-in Battery Precautions

Do not attempt to replace your Mi Band's battery or force open the built-in
battery.
Use only the official cable to charge your Mi Band.