This book examines the performance parameters of advanced batteries. The Neosonic polymer Li-ion phosphate battery technology has recently entered the battery market. There are a number of conventional Li-ion FePO4 battery manufacturers from the United States, Taiwan and China, but Neosonic has a more unique design with the polymer Li-ion iron-phosphate technology. The most significant limitation of the iron phosphate cathode material is the low energy density. However, as a result of the safety and power performance improvements, the polymer Li-ion iron phosphate battery technology is being evaluated for new market areas including utility energy storage, and other large energy storage applications.