NEC 750C - Manual (Page 28)

Getting Familiar with Your MobilePro 750C 2-15
NOTE
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.
6. Use the stylus to remove the drained battery from the
bay.
Removing the battery
7. Angle the new battery into the bay and insert it with the
positive (+) notation facing up.
Inserting the battery
8. Replace the sub-battery bay cover and slide the lock to
the locked position.
9. Tighten the screw to secure the bay cover.