Replacing the Battery Pack
4-6 IBM ThinkPad 310E/310ED: User’s Guide
3 Locate the pull tab of the battery; pull the tab to remove the
battery out of the battery bay.
4 Insert the fully charged battery into the battery bay (with its
connector side up) until you feel the contacts engage.
5 Replace the battery bay door.
6 Press the power switch.
The computer resumes normal operation from hibernation
mode.