Battery for Aspire: 9 cells / 9000mAh / Black LC.BTP00.119 No more worries about running out of power. This battery provides reliable performances when you are on the move. This product has been exclusively designed for Acer systems. Battery compatible with Aspire 3820T / 3820TG / 4738G / 4738Z / 4820T / 4820TG / 5747DG / 5820T / 5820TG / 7745 / 7745G Autonomy ≈ 3 hours Specifications: Warranty 6 months Function battery Main power battery Chemistry of battery Lithium ion: Newer type of rechargable, giving best performance for a rechargable. Capacity 9000mAh Weight: 600 g