Testing the endurance of Xiaomi’s biggest battery flagship

The Xiaomi 17 Pro Max comes equipped with a massive 7,500mAh battery, setting expectations high for long-lasting performance. With 100W wired and 50W wireless charging, Xiaomi clearly targets users who want both power and speed. But how does it hold up in a real-world day of heavy use across the UK?

Starting the morning at 100%, the phone easily handles typical early tasks such as emails, messages, and news scrolling. Even with the display brightness turned up and 5G enabled, the battery drains slowly during light activities. By midday, after a few hours of background app use and browsing, the battery typically remains around 80%, showing strong efficiency for general use.

As the day progresses, heavier tasks begin to push the phone harder. Streaming high-definition video, taking multiple photos with the Leica camera setup, and switching between productivity apps increase drain, yet the large capacity keeps the device stable. Even with occasional gaming sessions or navigation, the 17 Pro Max comfortably crosses the afternoon without anxiety about charging.

By late afternoon, with continuous social media use, Bluetooth music playback, and occasional hotspot usage, the battery usually drops to around 40–50%. This is impressive for such intensive activity. Xiaomi’s HyperOS and the Snapdragon 8 Gen 5 chipset manage power consumption well, preventing the kind of sharp drops that many smaller flagships experience under similar strain.

Into the evening, even with extended streaming or photography, the device still maintains enough reserve to last until bedtime. Heavy users report finishing a demanding day with about 20–25% charge left, meaning a full day of intense work and leisure is easily achievable. In moderate use scenarios, the 17 Pro Max can stretch comfortably into a day and a half.

Charging speed adds to the convenience. The 100W wired charger can take the phone from near-empty to full in under 25 minutes, while 50W wireless charging remains practical for office or bedside setups. For those who often forget to charge overnight, a quick morning boost easily covers the day.

Heat management is another area where Xiaomi performs well. Even under stress — long gaming sessions or 4K video recording — the phone remains relatively cool. This not only ensures comfort but also prevents the battery from degrading too quickly, maintaining long-term health over repeated charge cycles.

In comparison to rivals like Samsung’s Galaxy S25 Ultra and Apple’s iPhone 17 Pro Max, Xiaomi’s battery endurance ranks among the best. While it doesn’t double their runtime, the extra few hours it offers under strain can make a real difference for users who stay on the move all day.

For UK buyers, the real-world verdict is clear. The Xiaomi 17 Pro Max comfortably lasts through a full day of heavy use without compromise. Its combination of huge capacity, rapid charging, and efficient performance makes it a reliable partner for power users, travellers, and anyone tired of mid-day charging anxiety.

In conclusion, the Xiaomi 17 Pro Max isn’t just about big numbers — it genuinely delivers in daily endurance. Whether you’re streaming, gaming, or navigating for hours, it’s a flagship built to last from sunrise to well past sunset, proving its battery size is more than marketing talk.