The aim of the project is to design and implement a modular and mobile testing platform at the EduCity campus of Turku University of Applied Sciences for safe testing of batteries in extreme conditions or under severe mechanical stress over the entire battery life cycle. The main new feature of the test platform is the possibility of ' destructive testing', where the sample is destroyed by mechanical damage, fire or similar causes. Destructive testing methods are typically used in industry to determine, for example, the durability of weld quality or the behaviour and properties of a material. To the applicants' knowledge, no such platform for destructive testing as proposed exists in Finland. There is a huge need for such a testing platform, as self-fuelled fires (so called thermal runaway phenomenon), especially in battery cells, will become much more common in the future as transport becomes more electric. This project focuses on a test platform that allows data collection even in extreme situations. In this way, the project will contribute to the reuse of batteries in a circular economy. The new testing platform will provide significant new insights into the behaviour of batteries at different stages of their life cycle and under extreme conditions, which can be used to develop different simulation models. Industry can use the simulation models directly to support product design, making future electric cars and electric machinery safer to use, for example. In addition, simulation models built using these methods can be used to optimise electric power lines, for example for Second Life applications. The testing platform will enable new sme’s and new products to enter the market, especially for circular economy applications, as the test equipment will allow a reliable assessment of the safety of batteries in second-life applications also in other fields. One key second-life application for which battery metering data will be needed is in energy storage in buildings, made from recycled batteries. These so-called local batteries can be used to balance the energy demand and price peaks of the electricity grid. Without reliable information on the life-cycle behaviour of batteries, it will not be safe to build new local battery solutions. The results of this project will thus also contribute to the safe use of local batteries in the future.