There may be a few reasons why your batteries are draining faster than expected.
First, check to make sure the white cable on the inside of the lock is securely fastened. To do this, you will need to remove the battery cover from your lock, remove the 4 AA batteries and then unscrew the three small black screws (two in the battery compartment, one at the base of the lock interior) and dismantle the interior side of the lock. The white cable connecter has two ridges that should be facing outwards and the cable connecter should snugly fit into the adapter located on the interior side of the lock. This video can help.
Another reason why your battery may be draining could be that, if you’re using a smart home hub (i.e. Samsung SmartThings, Wink, Connected by August, etc), your hub may be too far away from your door. If you continue to see issues, please contact firstname.lastname@example.org.