High quality battery. Ideal for a replacement or a back up battery. Made from lithium-ion polymer and is fully tested and safe to work with your mobile phone. When using from new its always best to charge the battery for 10 hours to improve its quality and lastibility. These high capacity replacement batteries are each designed & tested specifically for your phone model. The high capacity battery also enhances battery performance by offering a lower internal resistance for extended life over our standard battery. Our batteries are safe to use, identical in size & shape to the original manufacturer"s batteries and far better value