Xiaomi Smart Band 9 Active: problems, parts and running costs

Checked: 2026-10-18

Summary

The Smart Band 9 Active is a budget band whose recurring problems are measurement accuracy rather than hardware: step counts off by 1,000-2,000 a day, heart rate wrong by 8-20 bpm in both directions, unreliable sleep timing, and owner reports of touch screens dying within 10 days to four months. Running costs nothing, because Mi Fitness has no subscription. It is worth $20 to $25, fair at $26 to $35, and weak above $36.

Common problems and fixes

Parts and consumables

No user-replaceable battery or sensors — the sensors are built in (PPG optical heart-rate sensor, accelerometer and ERM motor), and no official repair-parts channel or first-party spare parts exist for this model. [2][6]
Mi Fitness app — free, with no subscription and no paid tier; it keeps a month of data and syncs to Apple Health, Google Fit, Strava and Suunto. [4][10]

Yearly running cost

Nothing: Mi Fitness has no subscription, and the band has no consumables. [1][2][4][8]

When it is a good buy

$20 to $25: good buy. Owners quote about $20 in the aggregated owner reviews, the UK launch price was £19.99 (Wareable, December 2024), and Xiaomi’s UK store showed £15.99 at check time; Xiaomi Singapore sells it at S$30. [3][5][8][13]
$26 to $35: fair. Budget bands from Amazfit, Huawei and Honor add AMOLED screens near this price, so the reason to buy this one is the Xiaomi app and ecosystem. [3][4]
$36 to $50: weak. The vanilla Smart Band 9 has an AMOLED screen, automatic brightness and faster charging for slightly more money, and the Smart Band 9 Pro adds built-in GNSS. [3][4][10][11]
Above $50: not defensible on the measured accuracy and reliability evidence. [9][11]
Alternatives: the vanilla Smart Band 9 (AMOLED, about $50) for a better screen and faster charging; the Smart Band 9 Pro (built-in GNSS, about $90) if you run outdoors without your phone; an Amazfit, Huawei or Honor budget band for an AMOLED screen near this price. [3][4][10][11]