11.10V,4400mAh,Li-ion,Hi-quality Replacement Laptop Battery for LENOVO IdeaPad U450P 20031, IdeaPad U450P 3389, IdeaPad U550, Compatible Part Numbers: 57Y6309, L09S6D21 Voltage: 11.10V ///Capacity: 4400mAh Battery Type: Li-ion///Color: Black Dimension: 268.60 x 48.90 x 21.00 mm///Weight: 394.60 g