Dentsing 71R31 New Battery for DELL 462-3678 / LI-ION 9CELL 97WHR BATT LATITUDE E6540/ E6440 ATG Precision M2800 LAPTOPS Model:71R31 Color:Black Voltage:11.1V Capacity:97WH Compatible P/N:PRV1Y, 312-1165, M5Y0X, 2P2MJ, 71R31, 312-1325 Compatible with: Dell Latitude E6440 Latitude E6540 Precision M2800 Note: In the process of using the laptop battery, when the charge is about to run out, please plug in to fill the charge in time. Generally, the battery is so set that only 10% charge remains , it will remind the user to charge the battery again, if 5-6% charge is left, the computer will be in a state of dormancy, if the computer is this state, you must charge the battery in time, please don't let this state remain for too long 6 Months Warranty. If you have any issue, please contact us, we will help you resolve it before you leave a negative feedback or low review.Thanks for your kind support and patience.