Can I charge the battery via the Micro USB port on eufy smart lock touch & wifi?
No, you can’t.

The Micro USB port is only for powering the lock for emergency use to unlock the door. You can power it with a power bank and then unlock the door by entering the passcode or using fingerprints. It will not charge the battery inside.
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eufy S231 Smart Lock User Manual
Play videoHow to set up eufy Security Smart Lock Touch & Wi-Fi
How to set up eufy Security Smart Lock Touch & Wi-Fi
Play videoIntroducing eufy Smart Lock Touch & Wi-Fi
Introducing eufy Smart Lock Touch & Wi-Fi
Play videoeufy Security App Functions
eufy Security App Functions
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