One UI 9 update triggers battery drain reports on Galaxy S24 Ultra and S25

Owners of the Galaxy S24 Ultra and Galaxy S25 report severe battery drain after updating to One UI 9 on Android 17. One S24 Ultra user saw a 95% drop in just over five hours with only 3h15m of screen-on time, and Samsung has not confirmed a widespread fault.

• One Galaxy S24 Ultra lost 95% charge in just over five hours
• Some users now charge their phones three to four times a day
• Samsung has not confirmed a general One UI 9 battery fault
• Restarting, checking app usage or a factory reset may help