Replaces OEM # 01YU911, 01AY969, 5B10W13899, 5B10W13900, L17C4P72, L18M4P71, SB10Q76929, SB10S57317, SB10T83143 Fits: LENOVO THINKPAD P1 GEN 1, P1 GEN 1 20MD, P1 GEN 1 20ME, X1 EXTREME GEN 1, X1 EXTREME GEN 1 20MF, X1 EXTREME GEN 1 20MG Specs: 15.36V, 5075MAH, 77WHR, 4 CELL Brand New GreenTech replacement battery - 6 Month Replacement Warranty Each products has undergone rigorous testing to ensure the correct voltage, circuit protection, stable current, low self-discharge and CE / FCC / RoHS Certified for safety