Failure to charge may occur for several reasons:
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Charger failure: Make sure the charger is working properly. You can try to use other reliable chargers and data cables to charge to determine whether the charger is the problem.
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USB interface failure: Check whether the USB interface of the recorder is damaged or loose. If the interface is damaged, the charger may not be connected properly.
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Battery issues: The logger's battery may be damaged or too old to charge or stay charged. In this case, you may need to replace the battery.
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Software issues: Sometimes, the logger's software may have errors or crash, resulting in an inability to charge properly. Try restarting the logger or restoring factory Settings, and then try charging again.
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Other problems: If the above methods can not solve the problem, it is recommended to send the recorder to repair or contact the after-sales service center for further inspection and repair.
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Please note that before performing any repair or battery replacement, it is best to read the device's manual or contact the manufacturer to avoid possible problems and risks.