[rheavn]

"I wanted a key to have in case the batteries or circuit died. I also wanted a knob to turn to activate the deadbolt instead of depending on the batteries to move the bolt, since my bolt is snug."

Not questioning your choice, as I believe choices are good. Just to clarify the one that the dueling Steve's used has both a keyhole & a handle to open the lock.  Both work even if there are no batteries in the lock.