Untested, new in packaging Dell Laptop Battery Replacement M5Y1K is a 14.8V, 40Wh rechargeable Li-Ion battery designed for use with Dell Inspiron laptops. It comes with a 12-month warranty and is compatible with various Dell laptop models such as Inspiron 14, 15, 17, 5000, and 3000 series. This neutral-colored battery is reliable and has a high capacity of 2700 mAh, providing long-lasting power for your laptop.Listed as “for parts” because the unit is untested, although, it is new in factory sealed packaging.