SpecificationsModel: L17C4P72. Type: Li-ion. Voltage: 15.36V. Capacity: 80Wh 5235mAh. Up to 1000 recharge cycles over the life of the battery. Brand New Grade A cell battery, all Vanpir batteries are certified by UL / CE / FCC / RoHS for safety. Compatible Laptop ModelsFit for Lenovo ThinkPad P1 1st Gen (P1 2018) series. Lenovo ThinkPad P1 2nd Gen (P1 2019) series. Lenovo ThinkPad P1 GEN1 series. Lenovo ThinkPad P1 GEN2 series. Lenovo ThinkPad X1 EXTREME GEN 1 series. Lenovo ThinkPad X1 EXTREME GEN 2 series. Lenovo ThinkPad P1 GEN2-20QU series. Lenovo ThinkPad P1-20MD series. ThinkPad X1 EXTREME GEN 2-20QV series. ThinkPad X1 EXTREME GEN 2-20QW series. ThinkPad X1 EXTREME GEN 2-20M series. Replace Part Number L17C4P72, L17M4P72, L18M4P71, 01AY968, 01YU911, 01AY969, SB10S57317, SB10Q76928, SB10Q76929, 5B10W13900, 5B10W13899, 5B10W13953, 5B10V98091. Matters Need AttentionBefore purchasing, pl open your laptop case, check and confirm your original battery model and appearan