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Hello @Shifeng, thanks for bringing this to my attention. I'd like to begin giving you a warm welcome to our Community Forums! I'm here to assist you with your concern.
I'd like to appreciate your time troubleshooting this situation prior posting. If you haven't already do so, could you try our steps stated on our help article: Why isn't my battery charging on my Fitbit device? and let me know how your Ionic device behaves? Please keep me posted.
I'll be here. Let me know if you have any additional questions.
Best Answer