Laptop Battery for Dell Studio Series 1745 1747 1749,Compatible P/N: N855P U164P U150P N856P M905P 312-0186 Battery type: Li-ion; Capacity: 56Wh; Voltage: 11.1V; Cells: 6-cell. Compatible P/N: N856P U164P OW077P 312-0196 A3582355 M909P W080P Y067P Fit laptop models: Dell Studio 17 1745 1747 1749 Series Grade A cell ensure fast charges and low power consumption; Built-in circuit protection ensures both safety and reliability.