Lenovo ThinkPad T420 4236 User Manual page 131

4. Slide the battery into the computer.
5. Slide the battery latch to the locked position.
6. Turn the computer over again. Connect the ac power adapter and the cables to the computer.
Using the Extended Life Battery
For longer battery life an Extended Life Battery is available as an option. You can attach it to the docking
connector of your computer as follows:
1. Turn off the computer, or enter hibernation mode. Then disconnect the ac power adapter and all cables
from the computer.
2. Close the computer display, and turn the computer over.
.
Chapter 6 Replacing devices
113