Oracle X5-4 Service Manual page 175

Replace the System Battery (CRU)
Component damage. Do not deform the metal tab on the positive side of the battery.
Caution -
The metal tab maintains the positive battery connection and secures the battery in the holder.
Press the new battery into the battery holder with the positive side facing the
5.
metal tab that holds it in place.
Servicing CRU Components 175