GoKawiilApple released iOS 27 on Monday, Sept. 14, and the update brings Siri AI and a few other upgrades to your device. After you download the update, it might seem like your iPhone’s battery is draining faster than usual, but don’t worry. Apple wrote online that this is normal and — most important — temporary.
Apple released a statement in July 2026, saying if your iPhone battery drains quickly after downloading an update, it’s nothing to worry about.
“This is normal, because your device needs time to complete the setup process in the background, including indexing data and files for search, downloading new assets, and updating apps,” Apple wrote in a support page. “Immediately after completing an update, particularly a major release, you might notice a temporary impact on battery life and thermal performance.”
But your personal iPhone use could be contributing to battery drain, too. Apple said some features might need more resources to function, so depending on how much you use your iPhone, you might “notice a small impact on performance or battery life.”
So while your device might experience some additional battery drain at first, it should be a temporary issue after you download iOS 27. If you find you’re using your iPhone more after downloading iOS 27, that could be contributing to your battery drain, too.
For more iOS news, here’s what to know about iOS 27 and why I’m using Siri more often now.