Power Supply without "Power Saving Mode" -Seeking Advice on

Hi --I have purchased a USB LED light that come as part of a circuit that has a motion detector and a USB plug for power.  I need to power this so it will be portable and thought a USB power supply would be the perfect thing.  Problem is that when plugged in to a portable USB Power Supply and after it has turned the light on, set itself up and then turned the light off--to indicate it is motion detector mode--the power supply stops supplying power.  I have tried two different power supplies and have identical results.  I am assuming that the motion detector draws so little that the power supply thinks it's a charged battery and turns off.  Can anyone suggest a way to disable power supply mode or even a different method to obtain power.  My knowledge of electronics is very out of date so I apologize if I sound like an idiot to you people.   --Thanks

There are two types of USB power suppliers; the USB power supply and the USB power supply charger. It appears  you are  using the charger. Consider using a USB hub connected  to the charger then connect your led/motion detector plus a simple LED device.

The LED device would have a constant drain to keep the charger active?

see for example(18ma).

https://www.amazon.com/dp/B07RR3FQWF/ref=sspa_dk_detail_0?pd_rd_i=B07RR3FQWF&pd_rd_w=945qJ&content-id=amzn1.sym.0d1092dc-81bb-493f-8769-d5c802257e94&pf