Batterymarket High Performance Replacement Battery For DELL Studio Series 1745 1747 1749 , compatible P/N: N855P U164P U150P--[6cell, 56Wh/5200mah ] [Voltage(V)] 11.1. [Capacity(mAh)] 5200. [Cell] 6. [Color] Black. [Type] Li-ion. Compatible P/N: N856P U164P OW077P 312-0196 A3582355 M909P W080P Y067P Fit laptop models: Dell Studio 17 1745 1747 1749 Series 100% New from Manufacturer. Up to 500 recharge cycles over the life of the battery. 12 Months Warranty,if there are any problems, Please contact us, can be replaced free of charge.