TaoTronics Portable Night Light - Wireless LED Lamp, 360° Light Beam Lantern, Touch Control, Memory Function, Fully Adjustable Brightness, Cordless One-Handle Design - 4000mAh Rechargeable Battery

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•user manual for TT-DL23

TT-DL23__20160725_V1.3.pdf  

•user manual for TT-DL23

TT-DL23__20160725_V1.3.pdf  

FAQ

Not sure. But understand that this is a task light, not a room light. As such, it is an amazingy bright lamp for a desk or for reading that also dims to a reasonable level.
The LED requires low energy. When the light is off the battery inside replenishes a little and that is sufficient to re-light the bulb but only for a short time. Your light is fine - It means that your light needs charging again.
I use this great lamp until it will no longer stay on. Then you know it's time to recharge. So I allow the battery to loose its charge. Also use it while it's being charged, like yoiUr Cell.