Playing mobile games uses up a lot of battery. What can I do to extend battery life?

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The following actions reduce battery usage. In order of impact:

Screen brightness
Playing at maximum brightness significantly increases battery drain.

To reduce the drain, reduce the screen brightness.

Internet connection
In some of our games, for example the XCOM 2 Collection, you can download game data (in the background) when first launching and playing the game. To reduce the drain on the battery, download all data before first launch.

Internet connection speed also has an impact. Downloading data quickly via a high-speed WiFi connection typically uses less power than downloading for longer on a slower, mobile network connection.

Audio volume
Playing games at maximum volume slightly increases drain on the battery. To reduce it, lower the volume. Battery power can also be saved by connecting an audio device with its own power source, such as Bluetooth headphones.

Battery Health
All rechargeable batteries become less effective as they age; batteries deplete faster in older devices.

On iOS, you can learn more about your device’s battery by opening the Settings app and selecting Battery → Battery Health. More information on battery health and performance in general is available on Apple’s website.