NEC MOBILEPRO 700 Quick Manual page 17

Releasing the Battery Cover Lock
Using a small screwdriver, remove the screw and Sub-battery bay cover.
Removing the bay cover
When you loosen the screw, you can remove the Sub-battery bay cover by loosening the screw for five rounds. It
is not necessary to remove the screw completely.
Use the stylus to remove the drained battery from the bay.
Removing the battery
Angle the new battery into the bay and insert it with the positive (+) notation facing up.
Inserting the battery