HP DD522AV Hardware Guide - Page 38
Battery Packs, Running the Notebook on Battery Power
UPC - 829160158228
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3 Battery Packs Running the Notebook on Battery Power When the notebook is connected to external AC power, the notebook runs on AC power. When a charged battery pack is in the notebook and the notebook is not connected to external power, the notebook runs on battery power. The notebook switches between AC power and battery power according to the availability of an external AC power source. For example, if the notebook contains a charged battery pack and is running on external AC power supplied through the AC adapter, the notebook will switch to battery power if the AC adapter is disconnected from the notebook. You can leave a battery pack in the notebook or in storage, depending on how you work. Keeping a battery pack in the notebook enables the battery pack to charge whenever the notebook is connected to external AC power and also protects your work in case of a power outage. On the other hand, battery packs in the notebook slowly discharge when the notebook is turned off. For this reason, the primary battery pack is not shipped inside the notebook and must be inserted before the notebook can run on battery power. Hardware Guide 3-1