With Apple’s Power Reserve, even if the iPhone needs to be charged, you may still be able to tap to lock or unlock for up to five hours after your iPhone battery runs out. Power Reserve is supported on iPhone XS or later and Apple Watch Series 4 running watchOS 8 or later. You will need to have your Express Mode enabled for your home key on your device.
Power Reserve is a feature of compatible Apple devices, it is not a feature of Schlage or Schlage locks. Lock battery is unrelated to this Apple feature.
Even if your Apple devices, that house your digital home keys are without power, the access code associated with your home key will still work on the touchscreen keypad of the Schlage Encode Plus Smart Lock.
Apple’s support link for Power Reserve and express cards
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