Lenovo L20C4P73, L20D4P73, L20L4P73, L20M4P73 LAPTOP BATTERY Battery Type: High-quality Li-ion or Li-Polymer Voltage: 15.36V Capacity: 54.7Wh / 3564mAh Number of Cells: 4-Cell Condition: Brand New Compatible with (ThinkPad X13 Series): ThinkPad X13 Gen 2 (Type 20WK, 20WL) ThinkPad X13 Gen 2 (Type 20XH, 20XJ) ThinkPad X13 Gen 3 (Type 21BN, 21BQ) ThinkPad X13 Gen 3 (Type 21CM, 21CN) Replace Part Numbers: L20C4P73 L20D4P73 L20L4P73 L20M4P73 5B10W51819, 5B10W51820, 5B10W51817, 5B10W51818, 5B10W51855 SB10W51920, SB10W51921, SB10W51918, SB10W51919, SB10W51956 4 Cell Laptop Battery