Bay Valley Parts 6 Cells Battery 58Wh Replacement WU946 KM958 312-0701 312-0702 KM901 KM905 MT264 MT276 MT277 RM803 WU960 RM855 Compatible Dell Studio 1535 1536 1537 1555 1557 1558 PP33L PP39L Battery type: Li-ion; Capacity: 58Wh; Cells:6-cell; Voltage: 11.1V;Capacity:5200mah. High quality grade "A" cells. Charges quickly. Longer discharge time. Steady output and low power consumption. More than 500 times charge-discharge cycles.All products are Certified by CE ROHS UL1642 FCC for safety. Operation time for standard batteries(6-cell 5200mah): Around 2 hours the actual operation time will depend on how much electricity is required by the device and how you use it. 24 x 7 email support 12-month service. Compatible Models: For Dell Studio 1535 1536 1537 1558 1555 1557 A2990667 WU946 WU960 WU965 MT276 MT264 KM905 PW773 KM904 KM887 KM958 312-0702 312-0701 replacement notebook laptop battery batteries 12-months hassle-free warranty service. Please check if this battery is compatible with your computer before purchasing. Part numbers of compatible batteries and Computers are listed as following.