Lithium-ion (Li Ion) batteries deliver high power density, deep cycling capability and a service life much longer than that of Lead Acid batteries. Li Ion batteries also accept high charge currents and recharge very quickly. Li Ion batteries are maintenance free and ultimately deliver the lowest total cost of ownership. They can be used for outdoor applications because they discharge reliably at temperatures up to +60°C and can be recharged at temperatures up to +50°C. These properties make Li Ion batteries ideal for Telecom applications.