IEC 62830-5:2021 specifies the test method for measuring generated electric power from flexible thermoelectric devices under bending conditions. This document provides terms, definitions, symbols, configurations, and test methods that can be used to evaluate and determine the performance of flexible thermoelectric devices. This document also describes the test conditions such as temperature, temperature difference, contact conditions, insulation and bending radius of flexible thermoelectric devices. This document is applicable to flexible energy harvesting devices for flexible semiconductor devices.