IBM ThinkPad 310E User Manual page 72

The following procedure describes how to recharge the battery pack
with the AC Adapter when the computer is turned off.
1
Turn off the computer; open the battery cover; and install the
new or discharged battery pack into the computer.
2
Close the battery cover.
3
Connect the AC Adapter to the computer.
The system status indicators show the following:
Color Meaning
Orange The battery pack is being charged.
Green The battery pack is fully charged.
Charging the Battery Pack
Chapter 4. Using Battery Power
4-3