HP Pavilion dv7-4278nr Entertainment Notebook PC - Manual (Page 51)

To remove the battery:
1. Close the display.
2. Turn the computer upside down on a flat surface.
3. Slide the battery release latch to release the battery (1).
4. Pivot the battery upward (2), and then remove the battery from the computer (3).
Charging a battery
WARNING! Do not charge the computer battery while on board aircraft.
Using battery power 41