HP ENVY 13 User Manual page 61

To insert the accessory battery:
1. Close the display and turn the computer upside down on a flat surface, with the battery bay toward
you.
2. Align the accessory battery with the battery fuel gauge towards you and with the bottom of the
computer.
3. Press the accessory battery down until it is seated (1)
4. Slide the battery release latches (2) to lock the accessory battery into place on the computer.
To remove the accessory battery:
1. Close the display and turn the computer upside down on a flat surface.
2. Slide the battery release latches (1) to release the accessory battery.
Using battery power 51