Skyvast Extended Capacity New Laptop Battery for Dell Studio 17 1745 1747 1749 Series, P/N: N856P U164P M905P U150P 312-0196 [11.1V 85Wh] Battery type: Li-ion; Cells: 9-cell; Voltage: 11.1V; Capacity: 85Wh; Fit laptop models: Dell Studio 17 1745 1747 1749 Series Compatible P/N: N856P U164P M905P U150P 312-0196 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.