Quick Summary Smart lock batteries drain faster than expected for four main reasons: the lock is performing too many Bluetooth or Wi-Fi polling operations, the…
Quick Summary
Smart lock batteries drain faster than expected for four main reasons: the lock is performing too many Bluetooth or Wi-Fi polling operations, the motor is working harder than it should due to a misaligned deadbolt, the wrong battery type is being used, or the lock is in a cold environment (below 40°F / 4°C). Most users get 6–12 months from a set of AA batteries; anything less than 3 months indicates a fixable problem.
Expected Battery Life Reference
Step 1: Use the Right Battery Type
Not all AA batteries perform equally in smart locks. Use fresh alkaline AA batteries (Duracell Optimum or Energizer Ultimate Lithium for cold climates). Do NOT use rechargeable NiMH batteries. Their nominal voltage is 1.2V vs 1.5V for alkaline — this causes the lock to report low battery prematurely and reduces motor torque. Do NOT mix old and new batteries. Always replace all 4 batteries at the same time. For outdoor locks in cold climates (below 40°F): use Energizer Ultimate Lithium AA batteries. Lithium batteries maintain full voltage down to -40°F, while alkaline batteries lose 50% capacity at 32°F.
Step 2: Fix Deadbolt Misalignment
A misaligned deadbolt forces the motor to work harder on every lock/unlock cycle, draining batteries 2–3× faster than normal. Open the door and manually operate the deadbolt with the thumb turn. It should move smoothly with zero resistance. If it's stiff: the strike plate hole is misaligned. Loosen the strike plate screws, shift it slightly, and retighten. Check that the door closes fully without force. A door that requires pushing to latch puts extra load on the lock motor. For August locks: run Lock Calibration in the app after fixing alignment to reset the motor's baseline torque.
Step 3: Reduce Bluetooth and Wi-Fi Polling
Some smart lock apps poll the lock frequently to update status, which keeps the radio active and drains batteries. August app → Settings → Lock → disable Always Connected if enabled. This reduces Bluetooth polling frequency. Reduce the number of devices that have the August or Schlage app installed and running in the background. Each phone with the app installed polls the lock via Bluetooth when nearby. For Schlage Encode: check if any third-party integrations (SmartThings, Home Assistant) are polling the lock every few seconds. Increase polling intervals to 5+ minutes.
Step 4: Check Auto-Lock Frequency
If Auto-Lock is set to a very short interval (1–2 minutes), the motor runs many more cycles per day, draining batteries faster. August app → Settings → Auto-Lock → increase delay to 5–10 minutes. Schlage Home app → Auto-Lock → increase delay. Also check if any automations are triggering unnecessary lock/unlock cycles (e.g., a routine that locks and unlocks at the same time).
Step 5: Protect Against Cold Weather
If your lock is on an exterior door in a cold climate, battery drain in winter is normal and expected with alkaline batteries. Switch to Energizer Ultimate Lithium AA batteries for winter months. Consider adding weatherstripping around the door to reduce cold air exposure to the lock mechanism. Schlage Encode has a built-in heater in some models — check your model specifications.