Specification: Battery type:Li-ion Voltage:15.2V Capacity:63Wh; Recharge cycles: 500; The battery is durable and has overcurrent protection, anti-overcharge, anti-overdischarge and temperature control functions. Compatible Part Number: RJ40G 01K2CF 075X16 WY9DX 0WK3F1 0M3KCN 005R42. Compatible Laptop/Notebook Models: Replacement for Dell Latitude 14 5420 Series, Dell Latitude 15 5520 Series, Dell Precision 15 3560 Series, Dell P137G P137G001 P104F P104F001 P104F002. Note: There are 2 battery(RJ40G-63Wh and WY9DX-42Wh)of the Latitude 5420 5520 laptop,Please choose the which one you are going to replace and according to your laptop's original battery. Warranty & Support: Full refund in 30 days, 12 months warranty. If any issues about the product within 365 days, click the button "ASK A QUESTION" and CONTACT US, we will respond within 24 hours via emails and give you friendly after-sales service. Press [CTRL + F] to search your laptop model/part number.