This Brand New ASUS A3 8-Cell Replacement Battery uses premium quality battery cells that provide higher performance, reliability, and longer life. This battery is tested before shipment and backed by full ONE year warranty and 30 day satisfaction money back guarantee against defects in material or workmanship. We will pay for return shipping for defective item. This battery also uses state of the art protection circuit board and certified by CE and RoHS to ensure both safety and stability for your device. We are a responsible US based company since 2008. Our knowledgeable and friendly customer support staffs are here to help you anytime.