Ultralast lithium-ion rechargeable battery provides greener solutions for consumer portable power needs. It is a 3.2-volt battery that comes under the category of solar rechargeable battery. The everyday usable lithium phosphate battery has a capacity of 400 mAh. Use this solar light battery for solar-powered lights. Under the UltraLast Green brand is a complete range of rechargeable batteries and chargers, suitable for all your daily power needs.