Check that the device is connected to a power source.
The red indicator light stops illuminating when the battery is fully charged. The indicator light itself may have failed. Although, strangely, this has happened on a JBL speaker, the indicator on such devices should be of high quality. I understand when a cheap LED is on a child's cheap toy. I like the way the LED in https://www.vont.com/product/vont-bulb-color-smart-light-bulbs-smart-bulbs/. It would be cool to see indicators on devices with an LED like this so that it serves as a light bulb as well.