 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 Nashin Omar, Mohamed Doud, Peter van den Bosje and others.