Skyvast 11.1V 56Wh New Laptop Battery for Dell Studio 1745 1747 1749, N856P U164P OW077P 312-0196 A3582355 M909P W080P Y067P Battery type: Li-ion; Capacity: 56Wh; Voltage: 11.1V; Cells: 6-cell. Fit laptop models: Dell Studio 17 1745 1747 1749 Series Compatible P/N: N856P U164P OW077P 312-0196 A3582355 M909P W080P Y067P Grade A cell ensure fast charges and low power consumption; Built-in circuit protection ensures both safety and reliability. Exchange/Refund Policy: Free exchange/refund within 12 months. You can keep the order before we resend a new one and we will email a prepaid return label to help you return the order.