Compatible Models: ProBook 4510s, ProBook 4510s/CT, ProBook 4515s, ProBook 4515s/CT, ProBook 4710s, ProBook 4710s/CT, ProBook 4720s, ProBook 4720s Compatible part numbers: 513130-321, 535753-001, 535808-001, 591998-141, 593576-001, HSTNN-1B1D, HSTNN-I61C-5, HSTNN-I62C-7 HSTNN-IB88, HSTNN-IB89, HSTNN-OB89, HSTNN-W79C-7, HSTNN-XB89, NBP8A157B1, NZ375AA Please carefully check if your laptop and battery model is compatible replacement item Specifications: - Battery type: Li-ion - Voltage: 11.1 - Capacity: 4400 mAH - Brand: Unbranded /OEM What's in the box 1 X HP Probook 4510S, 4710S, 4720S Compatible Replacement Battery