Safety & Excellence Features: * No memory effect, fast charge * Low power consumption IC design * Fully compatible with the original laptops (models listed below) * Tested with strict quality control standards * Over-charge protection * Over-discharge protection * Over-heat protection * Over-current protection * Short-circuit protection * High capacity circulatory function Compatible with These Original Part Numbers: 0KM887, 0KM898, 0KM901, 0KM958, 0MT275, 0MT276, 0MT277, 0PW772, 0RM803, 0RM804, 0WU946, 0WU959, 0WU960, 312-0701, KM887, KM898, KM901, KM958, MT275, MT276, MT277, PW772, RM803, RM804, WU946, WU959, WU960, WU965, MT264, KM905, KM904, PW773 Fits Machine Models: Studio 15, Studio 1535, Studio 1536, Studio 1537, Studio 1555, Studio 1557, Studio 1558 Please make sure that the battery part numbers listed in the description matches the battery part number on your original battery before you purchase. Looking for the compatible AC adapter for your laptop? Please enter ASIN B0087IMC1C to find out in our store.