How long should batteries last in a smart lock?

How long batteries should last in a smart lock depends on type of batteries, usage, and connectivity, but generally 6 to 12 months is typical for most residential smart locks using 4 AA alkaline batteries. With moderate use of about 10 lock unlock cycles per day, good quality alkaline batteries last 6 to 9 months, while lithium AA batteries last 10 to 12 months and perform better in cold weather. Locks with WiFi built in drain faster, about 3 to 6 months, because WiFi uses more power than Bluetooth or Z-Wave, so locks like Schlage Encode with built in WiFi may need battery change every 3 to 6 months with heavy use, while Bluetooth only locks like August or Level Lock can last 6 to 12 months. Factors affecting battery life include frequency of locking unlocking, use of auto lock feature, temperature extremes, strength of WiFi signal, and use of features like fingerprint reader. Most locks give low battery warning 2 to 4 weeks before depletion via beeps, app notification, and LED. To extend life, use lithium batteries, reduce unnecessary remote access, ensure good WiFi signal, and keep firmware updated. Always keep backup key and replace all batteries at once.