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Replace Part Number: RJ40G 01K2CF 075X16 WY9DX 0WK3F1 0M3KCN 005R42 Model: RJ40G. Voltage: 15.2V. Capacity: 63Wh 3941mAh 4-Cell. Color: Black. 100% brand new. (Please open the back case of your laptop and check out the exact part number of your laptop's original battery Before placing your order) Safety: All products are rigorously tested to ensure correct voltage, circuit protection, capacity, stable current, low self-discharge and guaranteed battery life. Purchasing 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 .Note: 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 10-20% (not 0%), then charge and cycle 3-4 times to wake up the new battery Laqueena Warranty :12 month warranty (send a new replacement battery). If you have any questions, please contact us and we will reply by email within 24 hours.