Charging Speed ​​Drop Reported on Galaxy Phones After One UI 9.0 Update

After the One UI 9.0 update, there is a decrease in charging speed on Galaxy phones. Here are the details of the problem reported by Galaxy S25 series users.

Some Galaxy users who installed Samsung's new interface One UI 9.0 update are reporting that their phones are charging slower compared to the previous software version. While the complaints are especially concentrated on the Galaxy S25 series, it is stated that similar situations are also encountered in older Galaxy models.

One of the most striking changes in the shared measurements is seen on the Galaxy S25 +. It is stated that the charging power, which remained above 40W until the battery level reached 25 percent in One UI 8.5, dropped to 34W at 13 percent after One UI 9.0.

Changes in Charging Power and User Experiences

The user who performed the test stated that although he cooled the device so that the temperature did not affect the result, the power decreased to around 34W when the battery reached 13 percent. Although the phone briefly rises above 40W when the cable is disconnected and reconnected, the power drops back to 34W after about 10 seconds.

Similar complaints are also expressed by Galaxy S25 Ultra users. One user states that, in addition to Samsung's Super Fast Charging 2.0 supported official charger, he also tried an adapter from a different manufacturer, and that charging was slower in both cases.

It is noteworthy that in the complaints, both the maximum charging power reached and the time during which the high power level can be maintained vary. So far, Samsung has not confirmed that it has made any conscious changes to the charging profile of Galaxy phones with One UI 9.0.

Update and Security-Based Restrictions

It is said that due to the recent emergence of some battery and fire cases related to the Galaxy S25+, new limits focused on temperature and security may have been applied in charging management. However, there is no connection confirmed by Samsung between the charging change in One UI 9.0 and these events.

Software may not be the only cause of slow charging. In Galaxy phones, charging power can be automatically reduced when the device temperature rises; The adapter used, USB cable, battery protection options and the condition of the charging port can also affect the speed.

However, the difference in power level in comparative measurements made with the same phone and charging equipment before and after One UI 9.0 causes users to focus directly on the update. For now, there is no bug identified as a problem or a fix update prepared by Samsung.

There is no definitive data that all Galaxy phones using One UI 9.0 show the same behavior. Whether a system-wide change has been made in the charging curve will become clear through measurements on different models and battery levels and Samsung's statement. Have you noticed a similar charging slowdown on your phone?