akukestust

Akukestust is a term used in Estonian-language electronics discourse to denote the duration or lifespan of a battery—how long a battery remains serviceable before its performance falls below an acceptable level. In Estonian, the noun akukestus has inflected forms, including akukestust, depending on grammatical case. It encompasses both calendar life (time-related aging) and cycle life (aging with charge–discharge cycles). In practice, akukestus is often assessed by the end-of-life criterion, commonly around 80% of the original capacity, or when the battery can no longer meet required power or efficiency targets. State of health (SOH) and internal resistance are used to quantify aging.

Measurement and standards: Manufacturers and researchers report metrics such as cycle life (number of full discharge cycles until end-of-life), calendar life (years under specified conditions), and remaining capacity. Tests follow standardized procedures for specific chemistries, such as lithium-ion or solid-state cells, and vary by application (consumer electronics, automotive, grid storage).

Factors affecting akukestus: Temperature, depth of discharge, charging rate, cycling pattern, and calendar aging drive degradation. Chemistry matters: lithium-ion variants typically show different aging profiles than nickel-based chemistries or emerging solid-state designs. Manufacturing quality and usage patterns influence actual life.

Improving akukestus: Battery management systems, thermal control, modest depth of discharge, and moderate charging voltages can extend life. Avoiding sustained high temperatures and extreme fast charging helps.

In summary, akukestus describes how long a battery remains reliable, integrating calendar and cycle aging across chemistries and applications, and is influenced by design choices and operating conditions.