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The Smart Lock E31 WiFi Replacement Deadbolt uses 4 AA batteries, which are included but are non-rechargeable. If you wish to get additional batteries, you can purchase standard AA batteries at most retail or online stores. Make sure to replace the batteries with compatible AA types for maintaining the lock's functionality. If your goal is to use an alternate or rechargeable power source in emergency situations, you can charge the smart lock using a micro USB cable and a power bank via the USB port located at the bottom of the smart lock.
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