Dell Latitude 7290 Quick Start Manual page 6

WARNING: Before removing the battery, shut down the computer, and remove external
cables (including the AC adapter).
To install the battery
Slide the battery into the battery bay until it clicks into place.
For some computers, this requires that the battery be inserted at a 45-degree angle.
To remove the battery
Turn off the computer and turn it over.
1.
Slide the battery release latch or latches to the unlock position until it clicks into
2.
place.
Slide the battery out.
3.