[Battery
Information]: 4-Cell, best OEM quality, voltage
& capacity: 15.2V 63Wh.
[Note]: There are 2 batteries for the DELL Latitude 5420 and DELL Latitude 5520 laptop 4 Cell 63Wh (RJ40G) and 3 Cell 42Wh (WY9DX). Please choose the one you are going to buy according to your laptop's original battery. If the new battery is not recognized during the initial installation, please reinstall it and check whether the interface is fully connected. Discharge the new battery to 10-20% (not 0%), then charge and cycle 3-4 times to wake up the new battery.
[Certified Security]: 100% brand new from the manufacturer. Overcharge and overdischarge circuit protection; over-temperature and short-circuit protection; up to 500 recharge cycles over the life of the battery.
[Package Contents]: 1 pc brand new OEM battery