 This paper examined the performance of various lithium-ion chemistries for use in plug-in hybrid electric vehicles. It found that lithium-ion batteries have higher energy densities than lead acid or nickel metal hydride batteries, making them ideal for use in these types of vehicles. Additionally, lithium-ion batteries have higher power densities than lead acid or nickel metal hydride batteries, making them suitable for applications requiring rapid charging and discharging. This article was authored by Naushan Omar, Mohamed Doud, Peter Van Den Bosje and others.