Disabling Connectivity Assist may restore iOS 27 battery life

Following the update to iOS 27, some iPhone owners have noticed a decline in battery duration between charges. While this issue is not classified as a universal crisis affecting all users, specific reports indicate that the new operating system has negatively impacted battery performance for certain devices. One potential culprit identified by users is a feature known as "Connectivity Assist."

How Connectivity Assist Works

The primary function of Connectivity Assist is to utilize cellular data when Wi-Fi signal strength becomes too weak. Theoretically, this ensures connection speed remains stable when leaving a Wi-Fi coverage area, preventing slow load times before the connection drops entirely. Once out of Wi-Fi range, the device relies fully on the mobile network.

This mechanism differs from its predecessor, "Wi-Fi Assist," which existed prior to iOS 27. In earlier versions, Wi-Fi Assist only switched to cellular data when the Wi-Fi signal was extremely poor. With the introduction of Connectivity Assist in iOS 27, it appears the iPhone can utilize both networks simultaneously. This dual-network usage may be draining battery power at a higher rate than previous iterations.

DNS Requests and Ad Blockers

A new addition to Connectivity Assist involves sending DNS requests via cellular data. Unlike Wi-Fi Assist, this behavior can bypass rules set by ad-blocking tools designed to prevent pop-ups from reaching the phone. Apple itself recommends disabling Connectivity Assist if an ad blocker is active. Continuing to send DNS requests over cellular data while circumventing active blocking tools may place additional strain on the battery.

User Reports and Solutions

According to Lifehacker, a Reddit user named ZoteTheMitey shared their experience in the r/iPhone community. The user reported that their iPhone 15 Pro Max, with a battery health of 89%, lasted only three to four hours after upgrading to iOS 27. After disabling the Connectivity Assist feature, the battery usage time increased to seven hours.

Other participants in the discussion noted similar outcomes, with one user stating that turning off the feature resolved overheating issues on their device. To implement this fix, users can disable Connectivity Assist for a specific network by navigating to Settings, then Wi-Fi, and tapping the (i) icon next to the network name. Alternatively, the setting can be adjusted globally within the main settings menu.