What is the ambient temperature of using Amazfit Band 2?

0℃ to 40℃. Notes: The working temperature limit of a conventional lithium battery is -20℃ to 60℃. Generally, when the temperature falls below 0℃, the lithium battery's performance will drop rapidly and its discharge capacity will reduce accordingly. Therefore, the normal operating temperature of lithium batteries is 0℃ to 40℃to ensure stable performance.