Laptop Battery PATONA for Dell Latitude E5440/E5540, 4400mAh, Li-Ion, 11.1V:Has your laptop battery been losing charge? The battery PATONA for Dell Latitude E5440/E5540, 4400mAh, Li-Ion, 11.1V is the right choice for selected models of Dell laptops. A flat laptop battery or a power failure wont upset you anymore. A backup laptop battery is useful as a second battery when you are on holiday and you cant access an electrical outlet, but still want your laptop to stay switched on. The battery features 6 piece(s) quality cells and offers a capacity of 4400mAh. PATONA for Dell Latitude E5440/E5540, 4400mAh, Li-Ion, 11.1V Battery Key Features Alternative Lithium-ion (Li-ion) battery Safe alternative to the original battery Capacity: 4400mAh, voltage: 11,1V Provides your laptop with power when youre travelling Ensures an improved battery life and allows you to work longer Tip: Frequent use reduces battery life. Please adhere to the instructions on correct discharging and charging that can be found in the manual to prevent capacity loss.