1P and 2P refer to the configuration of cells within a battery pack. For instance, in a 1P battery pack, one cell is used per module, while in a 2P configuration, two cells are. A 1P104S battery pack is a high-voltage lithium iron phosphate (LFP) battery module widely used in utility-scale and large commercial energy storage systems. Its ratio, often expressed as P (Power/Capacity), describes how quickly a battery can discharge or charge relative to its stored energy. 5P → The battery. What Do 1P and 0. 5P Mean in Battery Systems? In lithium battery terminology, the "P" stands for parallel connections. 2P & 1P Battery: What Does Mean? “P” stands for “Parallel,” and the number preceding it indicates. “P” stands for “Parallel,” and the number preceding it indicates how many cells are connected in parallel within a module.