Samsung Galaxy S24/S25 Ultra drain, heat after July update

Owners of Samsung's Galaxy S24 Ultra and S25 Ultra smartphones are reporting significant performance issues following the installation of a recent security update, with widespread complaints of severe battery drain, overheating, and slower charging speeds. The problems began appearing after the July 2026 security patch was distributed, with users detailing their experiences on Samsung's official community forums and on Reddit.

According to numerous user reports, the issues manifest as rapid battery depletion even when the phone is idle. One S25 Ultra owner stated their device's battery dropped from 85 percent to around 5 percent in roughly 12 hours, with only about two hours of active screen time during that period. Another user reported losing 5 to 7 percent of battery charge per hour while the phone sat unused on a flat surface. Alongside the drain, many users note their devices are running noticeably hotter than usual, with some describing the heat as severe. A separate but related complaint involves charging, with some S24 Ultra owners reporting that a full charge now takes up to three hours, a significant increase from the approximately 70 minutes it took prior to the update.