This is a brand new Dell premium grade replacement battery. The superior South Korean cells inside the battery cartridge will provide longer run times between charges as well as a longer service life than cheaper batteries. In addition, Li-ion batteries are not subject to the memory effect common with older battery technology. This means you can recharge your laptop any time without diminishing your battery capacity. This laptop battery replacement is typically superior to the original battery and is 100% compatible with your Dell notebook computer. The battery is individually tested before shipment and backed by 30 day complete satisfaction guarantee and a 2 Year warranty.

You can expect about 2 hours to 2-1/2 hours of run time with this Dell W0Y6W battery when new, depending on your energy use. If you are looking for even longer battery run times, check out our extended run battery for your Dell laptop. The higher capacity battery cells inside this cartridge have an energy capacity of 5500 mAh. This battery will be compatible with batteries rated at 4400 & 4800 mAh capacities while providing up to 20% more run time

This battery replaces the Dell laptops: Dell XPS15-L521x or XPS 15 L521