What is the Ah of a Lithium-ion Battery? What is Ah? Ah is a crucial metric in lithium-ion batteries, describing the battery's capacity and its ability to operate. In this article, we'll explore the nature of Ah and the key role it plays in understanding and calculating battery performance. Part 1: What is A or Ah? A (short for "Ampere") is a unit of measurement for electric current. It repre...