Most battery technology has been developed for the automotive industry and the test standards used to-date are not really fit for purpose, especially given that aerospace standards are still evolving. Predicting how lithium-ion batteries will age and degrade is very difficult and currently not well understood, and even worse, lithium-ion batteries fail in ways which are difficult to predict and model and present new hazards which need to be understood in far greater detail. Can these challenges be overcome within a reasonable time scale and budget?