Xiaomi Redmi Note 4’s 4100mAh non-removable battery lasted for 15 hours and 10 minutes in our continuous video playback test, which is impressive for a battery of this capacity. In real-world use, the phone was able to last for up to two days. With heavy usage, we got to nearly a day and a half without needing to use any of the battery saving modes. We were especially impressed with the handset’s ability to latch on to weak cellular as well as Wi-Fi network signals. We were not provided with a retail box with all accessories for our review, and so we can’t comment on how long it would take to charge with the bundled changer. However, there is no support for quick charging, which would have been a welcome feature at this price level.