When the LED turns green, it indicates the battery is more than 80% charged. However, in a drained state, the green light may briefly activate due to current flow. To ensure proper charging, we recommend charging the product for about 5-6 hours when you first open it and during subsequent charges.
moss air faq
Why does the LED turn green and the humidifier stop spraying when charging from a drained state?
Von Henry Lee

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