DELL WY9DX 11.4V 42Wh 3-Cell Li-on Notebook Battery For DELL Latitude 5420,Latitude 5520,Precision 3560 Series Laptops P/N: RJ40G WY9DX 0WK3F1 WK3F1 0M3KCN M3KCN 01K2CF 1K2CF 075X16 75X16 005R42

Note:There are 2 batteries ( 4 Cell 63Wh --- RJ40G and 3 Cell 42Wh --- WY9DX) of the DELL Latitude 5420 ,DELL Latitude 5520 and DELL Precision 3560 Laptops. Please choose the which 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 and check if the interface is fully connected. Discharge the new battery to 3% (not 0%), then charge it fully .
[ Battery Information ]:3 Cell Lithium Ion Best OEM Quality , Voltage &Capacity :11.4V 42Wh
[ Warranty ]: Full Refund within 60 days , Replacement freely within 12 months ,everyday online email support
[ Certified Security ]:100% Brand New from 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 pcs Brand New OEM Battery