Specifications: - Battery type Li-ion - Voltage 11.1V which is also compatible with 10.8v - Capacity 4400 mAH - Brand Unbranded ,OEM Compatible Models: Dell Studio 1535, 1536, 1537, 1557, 1558 Compatible Part Numbers: 312-0701, A2990667, KM958, WU946 What's in the box Laptop Battery