Laptop Battery AVACOM for HP EliteBook 740 840 Li-Pol 11.1V 4200mAh:Do you need to improve the battery life of your laptop? This laptop battery AVACOM for HP EliteBook 740 840 Li-Pol 11.1V 4200mAh is a backup power supply for selected models of HP laptops. A flat laptop battery or a power cut will not be your problem anymore. A spare laptop battery is useful as a second battery for your travels when you dont have access to an electrical outlet, but still need to keep your laptop running. This model consists of 3 piece(s) high-quality cells and provides a capacity of 4200mAh. AVACOM for HP EliteBook 740 840 Li-Pol 11.1V 4200mAh Battery Key Features Alternative Li-pol battery Safe substitute for the original battery Capacity: 4200mAh, voltage: 11,1V Supplies your laptop with power when youre travelling Ensures an improved battery life and allows you to work longer Tip: Frequent use causes the battery to wear out. Follow the instructions on correct handling and charging that can be found in the manual in order to reduce the risk of compromised performance.