Ahmadreza Samadi / HomeExplainer · Everyday technology
Why does your phone stop charging at 80%?
A chosen limit, a learned routine and a heat pause can look similar. They have different triggers and different ways to resume charging.
At a glance
A chosen limit can stop charging near its ceiling on supported phones. Optimised charging can delay a full charge so the battery reaches 100% near your usual unplugging time. An iPhone may limit charging above 80% when too warm, then resume after cooling. Features vary by model and software: check the battery message and settings. The film’s wear chart is illustrative; no lifespan gain is promised.
Watch the film
67-second animated film with English narration and subtitles. The phone, settings and battery-wear chart are illustrations, not measured data. Features vary by model and software. Narration is AI-generated.
1. Did you choose a charging limit?
Some phones stop near a chosen ceiling. Supported iPhones offer limits from 80% to 100%; supported Pixels offer 80%. An occasional full charge can keep the battery estimate accurate. Apple and Google describe the settings.
2. Is optimised charging delaying a full charge?
Optimised charging can delay filling the battery so it reaches full near your usual unplugging time. This differs from a fixed limit: it is intended to finish at 100%. It may not engage on every night. Google explains Adaptive Charging.
3. Is heat limiting your iPhone’s charging?
An iPhone may limit charging above 80% when temperatures are too high, then resume after cooling. Changing a chosen limit is not a fix for heat. Let the phone cool in a suitable environment. Apple temperature guidance and charging support.
Less time full, less heat
Apple says reducing time spent fully charged helps reduce wear. Heat can also shorten battery life. Check the battery message and settings to understand the cause before changing anything. There is no promised lifespan gain here, and the film’s wear chart is illustrative.
Watch this film on its dedicated page
Watch on your preferred platform
Sources
Primary sources checked on 5 October 2026.