akkukesto

Akkukesto is a Finnish term used to describe the usable life of a battery-powered device between charges. Literally combining "akku" (battery) and "kesto" (durability or endurance), it is commonly equated with battery life in English and is a core specification for consumer electronics in Finland. The term can refer to the runtime of a device on a full charge, as reported under standardized testing, or more generally to the device’s practical endurance in everyday use. In many spec sheets, akkukesto is expressed as hours of continuous use for typical tasks or as an expected number of charge cycles before the battery's capacity falls to a specified level (for example, 80% of the original capacity).

Factors affecting akkukesto include battery chemistry (for example lithium-ion or solid-state), capacity (mAh or Wh), device power demands, screen usage, wireless activity, and environmental conditions such as temperature. Aging reduces akkukesto over time. Usage patterns—high screen brightness, frequent gaming, or video streaming—can shorten it. Conversely, power-saving features, adaptive performance, and charging strategies can extend real-world akkukesto.

Measurement and interpretation: Manufacturers test under controlled conditions that may not reflect real-world use; users should expect variation depending on tasks and settings. Battery management systems and software optimizations influence perceived akkukesto even with identical hardware.

See also: Akku (battery), Kesto (endurance), Battery life.