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On a twenty-minute full charge, the FunKey S has an average battery life of an hour and forty-five minutes. The device's battery life is impacted by CPU usage in addition to brightness and audio levels, so depending on those factors, the experienced battery life can deviate by roughly thirty minutes in either direction from the average. In practice, this means that low-intensity emulation such as that of the Game Boy will result in above-average battery life, while high-intensity emulation such as that of the PlayStation will result in below-average battery life. Additionally, the device has a blue LED light that indicates when it is charging, with a battery symbol in the top right corner of the main menu indicating the current charge level. When the FunKey S begins to run low on charge, a charging notification appears on screen.