The Tapkey Smart Lock provides a three-stage battery warning system. During the first and the second stage, you can expect up to another 500 unlock cycles per stage.
Whenever a smartphone or transponder is presented to the lock, the lock will start flashing red and green, finishing with a single blue flash. The single blue flash in the end indicates it's the first battery warning stage.
The pattern ends with two blue flashes, indicating the second battery warning stage.
The pattern ends with three consecutive blue flashes, indicating the third battery warning stage. At this stage, the Tapkey Smart Lock will not open anymore and the batteries must be replaced. But no worries, it can be done from the outside, even with the door locked.