The following factors affect the battery life of your Nuki Smart Lock:
Number of lock operations The more locking operations the Smart Lock has to perform, the faster the batteries or the Power Pack of the Smart Lock will run out. With an average use of 8-10 lock operations per day, the included alkaline batteries will last several months until they are completely drained.
Note: For a longer battery life we recommend the Nuki Power Pack. The Nuki Power Pack is a powerful and rechargeable battery pack that is specially designed for your Nuki Smart Lock.
Low temperature The ambient temperature affects batteries and rechargeable batteries: At low temperatures, they drain much faster. Additionally, severe temperature changes often cause doors to deform. If temperatures drop, doors begin to warp, usually making them stiffer to lock or unlock.
Opening the door If you have a knob or bar on the outside of your door, and therefore the latch is pulled frequently ("open door"), battery life may be significantly reduced. Pulling the latch involves an increased amount of force. At the same time, the distance that has to be covered to open it is also longer than for an unlocking action. We recommend using the Nuki Power Pack, because the Nuki Power Pack can handle power peaks much better than alkaline batteries.
Number of door sensor state changes Under certain circumstances, the door sensor can also have a negative impact on the battery consumption. This is the case if the door sensor frequently changes between the "open" and "closed" statuses. In the course of each status change, the Smart Lock is woken up from sleep mode to display the status correctly and, if necessary, also synchronize it via your Nuki Bridge to the Nuki Web. In sleep mode the Smart Lock consumes much less power. It is therefore worth taking a closer look at the proper functioning of the door sensor in case of increased battery consumption.
Stiff door The Nuki Smart Lock works with a force of 2Nm - this is about the force an adult has turning the key with one hand. So in principle, stiff doors are no problem for the Nuki Smart Lock. However, the stiffness of the door is related to the battery consumption. The stiffer the door, the more current has to be used to power the motor of the Nuki Smart Lock. This reduces the battery life.
To keep battery consumption as low as possible, always check if the key can be turned easily and without great effort when the door is closed. If more force is required to turn the key when the door is closed, it is best to contact a professional to adjust your door for you.
Communication via Bluetooth If the status of your Smart Lock is frequently queried via Bluetooth or via integrations, this increases the battery consumption of the Smart Lock. Smart home automatization in particular can be associated with an increased number of status queries and thus have a drastic effect on power consumption. In the course of each status query, the Smart Lock is woken up from the sleep mode, which requires additional power and reduces battery life. In idle mode, the Smart Lock requires significantly less power.
Wrong battery type configured/detected Your Nuki Smart Lock tries to automatically detect which battery type is used. This optimizes the respective thresholds for the battery warning. You can also set the battery type manually in the Nuki App. To do so, tap on the desired Smart Lock in the Nuki App and open the settings. Then go to "Manage Smart Lock" > "Battery Type". If an incorrect battery type is set or detected in the "Manage Smart Lock" section, battery life will be shortened and/or false battery messages may occur.