Home lock calculator
Smart Lock Battery Life Estimator
Estimate battery life from daily use and connectivity assumptions.
Result
Replacement interval, high (months)
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Replacement interval, low (months)
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Sets per year (high-use pace)
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Formula
Calculation logicBattery chemistry, temperature, connectivity, and the lock model can materially change actual life.
Smart-Lock Power, Signal, and Battery Life
Signal decides the protocol
Estimate 2.4 GHz RSSI from router distance plus 9 dB per wall. Above -65 dBm suits direct Wi-Fi; -65 to -75 is marginal; below -75, use a hub or move the access point. More than 6 Wi-Fi locks per access point needs a dedicated SSID.
Battery math
Wi-Fi drains fastest, Z-Wave/Thread slowest. Freezing weather cuts alkaline capacity first; lithium holds up. Treat the low end of the interval as the shopping trigger and keep one spare set per lock.
Verify before you buy
- Use the busiest door for daily cycles
- Note winter exposure
- Write the install date on the pack