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Talktime or talk time is a term used in the mobile device industry to describe the duration of constant use supported by a device's single fully charged battery. This typically occurs while in a cellular call, because of its simplicity and ability to equally measure talktime across all devices.

Talktime is highly dependent on the cellular network environment, such as the distance to the closest cell tower, as the device will increase transmission power when the signal strength wanes. Moving fast, such as being in a vehicle in motion, negatively affects talktime.

Mobile device manufacturers measure talktime in controlled conditions, and quoted amounts of device talktime are rarely reached in real-life scenarios.