Skyvast New Laptop Battery for Dell Alienware M17x R3, Dell Alienware M17x R4, Type BTYVOY1 BTYV0Y1 The actual operation time will depend on how much electricity is required by the device and how you use it. Laptop model: Dell Alienware M17x R3 R4 Series, Not fit M17X R1 R2 Battery model: BTYV0Y1 C0C5M 5WP5W 7XC9N 318-0397 Operation time: Around 3.5 hours Exchange/Refund Policy: Free exchange/refund within 12 months.