The DTK 5200mAh 6 Cell Battery for Dell E6420 E6520 is a brand new sealed battery designed specifically for Dell laptops. With a capacity of 5200mAh and 6 battery cells, this battery provides long-lasting power for your laptop to keep you connected and productive throughout the day. Compatible with Dell E6420 and E6520 models, this battery is a reliable and efficient choice for extended use on the go.