HP Notebook 6-Cell Battery. Compatibility: HP Pavilion: dv4, dv5, HP HDX: HDX 16 HP: G50, G60, G70 Compaq Presario: CQ40, CQ45, CQ50, CQ60, CQ70. With a second battery you can work, play and watch movies up to twice as long without plugging in. Specially designed and tested to meet the power needs of your HP notebook. Recharges within the notebook using your AC adapter, whether the the notebook is turned on or off. Want maximum battery life so you, friends, and family can keep playing games, watching videos, listening to music, or viewing photo slide shows - without having to plug in your AC adapter. With your HP notebook PC's Smart Lithium Ion battery, which works with the notebook's power management features to reduce power consumption, you'll be able to work longer than with other types of batteries plus, the battery charges completely even if it isn't fully discharged. Slim battery profile fits flush under notebook Genuine HP batteries are designed for and tested with all compatible HP notebook PCs so HP can deliver the highest quality products, services, and solutions to your home Technical Specifications Energy - Voltage 10.8V Amp-hour capacity 2.55 4.4Ah Watt-hour 55 48Wh Operating Temperature charging 32 to 113 degrees F (0 to 45 degrees C) Operating temperature discharging 14 to 140 degrees F (-10 to 60 degrees C) Non operating Temperature -4 to 140 degrees F (-20 to 60 degrees C)