Compaq 247320-003 - Deskpro 4000 - 5166 Model 2500/CDS Reference Manual page 231

4. Change the jumper at E50 from pins 1-2 to pins 2-3.
5. Place the pale blue sticker included with the battery kit
above the power connector on the back of the computer
6. Replace the expansion board cage and computer cover or
side panel.
7. Plug in the computer.
8. Turn on the computer.
9. Run Computer Setup to reconfigure the system
If you normally lock the Smart Cover Lock, use
Computer Setup to relock the lock.
If the computer has a Compaq hard drive, you have
now successfully completed the installation.
If the computer has a third-party hard drive, you must
reconfigure the hard drive using the parameters you
recorded before you began the installation procedure.