Redmi Band 4 Launched in China With 21-Day Battery Life

• Redmi Band 4 has launched quietly in China as the successor to the Redmi Band 3 fitness tracker.
• The band features a 1.47-inch display with a 60Hz refresh rate and a metal-textured unibody frame.
• Battery life is rated for up to 21 days, while India availability and pricing remain unannounced.

Redmi Band 4 has quietly launched in China, bringing a new fitness band from Redmi and succeeding the Redmi Band 3, which launched in 2024. The new model combines a 1.47-inch display with a metal-textured frame, a revised strap clasp and health-tracking features.

Redmi says the band can last up to 21 days on a single charge, compared with the Redmi Band 3’s stated 18-day battery life. The company has not announced the Redmi Band 4’s price or availability in India, so those details remain unknown for now.

Redmi Band 4 Specifications

Metal-textured frame and curved display glass

The Redmi Band 4 uses a metal-textured frame and a unibody design. The display is covered by 2.5D curved cover glass, giving the front a curved edge rather than a completely flat finish. Redmi has paired these design details with a 1.47-inch screen that supports a 60Hz refresh rate.

The screen size and refresh rate are among the confirmed details for the new band, but no further display specifications have been announced in the information available. Details such as resolution and peak brightness should therefore not be assumed.

Updated strap clasp and 5 ATM water resistance

The band comes with a vertically textured strap and an updated pin-style clasp. Redmi says the clasp is intended to provide a secure fit during workouts. The strap design is one of the visible changes highlighted for this generation, with the fastening mechanism aimed at keeping the band in place during activity.

The Redmi Band 4 also has a 5 ATM water-resistance rating and is described as safe for swimming. This makes swimming one of the activities it is designed to accommodate. Water resistance ratings do not mean a device is suitable for every water-related activity, so users should follow the product’s official care guidance when it becomes available.

Battery life rated for up to 21 days

Redmi rates the Band 4 for up to 21 days of battery life on a single charge. For comparison, the Redmi Band 3 launched in 2024 and offered up to 18 days, according to the details provided for the two models. The new band’s stated maximum is therefore three days longer than its predecessor’s rating.

With regular usage, battery life is around eight days. Actual results can vary depending on how the band is used, including the features and monitoring functions that are active. The up-to-21-day figure should be treated as a maximum rating rather than a guarantee that every user will get the same duration.

Health and fitness tracking features

The Redmi Band 4 includes all-day stress monitoring, blood oxygen tracking using SpO2, heart rate tracking and women’s health management. These features cover several common health and activity monitoring needs in a fitness band. The announcement details do not specify additional workout modes, GPS support or other sensors, so those features cannot be confirmed here.

As with other wearable trackers, health measurements are intended to help users monitor trends and should not be treated as a medical diagnosis. More information about how each function works may become available when Redmi publishes the full product details.

Redmi Band 4 price and India availability

The Redmi Band 4 has launched in China, but its price has not been announced in the information available for this report. Redmi has also not confirmed whether or when the fitness band will reach India. Buyers in India will need to wait for an official announcement before its local availability or pricing can be established.

For updates about the brand and its products, users can visit Xiaomi’s official website. For a related wearable from the same brand family, see our coverage of the Xiaomi Smart Band 9 specifications and features.

Conclusion

The Redmi Band 4 has arrived in China with a 1.47-inch 60Hz display, a metal-textured unibody design, 5 ATM water resistance and health-tracking features. Its rated battery life reaches up to 21 days, although regular usage is rated at around eight days and real results vary. Pricing and India availability have not been announced yet.

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