Electronic deadbolt systems

An electronic deadbolt comprising:

• a bolt compartment having a bolt axis and configured to house a bolt module, wherein the bolt module comprises:
• a motor;
• a lead screw configured to be rotated by the motor about the bolt axis;
• and
• a deadbolt coupled to the lead screw and upon rotation of the lead screw, is linearly extendable from the bolt compartment along the bolt axis;
• a battery compartment having a battery axis and configured to house a battery module, wherein the bolt axis is substantially parallel to and offset from the battery axis;
• and
• a face plate releasably coupled to the bolt compartment and the battery compartment.

A method of installing an electronic deadbolt on a door, the method comprising:

• boring two substantially cylindrical holes adjacent to one another on the door;
• inserting at least a portion of the electronic deadbolt into the two cylindrical holes, wherein the electronic deadbolt includes a face plate and a housing including a bolt compartment and a battery compartment, wherein each compartment is inserted within a respective hole, and wherein a bolt module is disposed within the bolt compartment and a battery module is disposed within the battery compartment;
• and
• securing the face plate to the door.