Once your laptop runs out of power supply, our 11.1V 5200mAh 6-Core Replacement Laptop Battery for Dell Latitude E5420 E5520 6520 T54FJ 8858X will do you a favor. Adopting the latest technology, this battery is of great quality. 5200mAh capacity ensures a long service time. With fine workmanship and strict examination, this battery is up to standard that you can trustingly use it without any worry. This battery will certainly make your laptop regain energy by the use of the high capacity battery. In a word, we offer you a highly cost-effective product with which you will enjoy your playing!