Hi couchpotato74,
Thanks for reaching out to the Google Nest Community Forum. I’m sorry to know your thermostat isn’t charging properly using a USB cable. So don’t worry; I’m here to help.
To get a better understanding of the situation, please help me out by answering the following questions:
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What model of thermostat do you have? If you’re unable to recognize, for your reference check out this article: How to tell which Nest thermostat you have.
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When did the trouble start?
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How long did you charge your thermostat?
If you have any more information that could be helpful, please let me know.
Best regards,
Daniel
