The smartwatch with the best battery I've tested is also one of the cheapest
Briefly

The latest Xiaomi Smart Band 9 offers extensive health-tracking features and battery life comparable to a smartwatch but in a more compact, lightweight design.
Xiaomi advertises the Smart Band 9 as having a battery life of up to 21 days on a single charge, making monitoring seamless even with various metrics.
While the Smart Band 9 covers most basic functionalities of a smartwatch, it lacks the advanced quality-of-life features and personalized insights of premium models.
With over 150 sports modes and capability for tracking heart rate, blood oxygen, stress, and sleep, the Smart Band 9 is a versatile fitness companion.
Read at ZDNET
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