 The International Electrotechnical Commission, IEC, and the International Organization for Standardization, ISO, have been working together to develop standards for lithium-ion batteries. These standards include testing procedures for determining the charge and discharge capabilities, power performance, and life cycle of the batteries. A new method was also developed to determine the life cycle of a battery in relation to its death of discharge. This article was authored by Yuri van Mierlo, Peter van den Bosche, Omar Heggazi, and others.