What do the flashing lights mean while charging my zero trace flashlight

Purchase it through amazon at cheaper price.

The indicator light flashing purportedly usually means the battery is low or the vacuum is being charged.

https://bestvacuumhq.com/shark-vacuum-brush-roll-indicator-light-not-on

Battery already fully charged, or battery is defective, or charger is defective

This light often means that it is in charging mode, or it can mean that there is a problem.

https://video.search.yahoo.com/yhs/search;_ylt=A0LEVi2ocEdYehQAF.8PxQt.;_ylu=X3oDMTByMjB0aG5zBGNvbG8DYmYxBHBvcwMxBHZ0aWQDBHNlYwNzYw--?p=Zero+Trace+Flashlight+Instructions&fr=yfp-t-900&hspart=att&hsimp=yhs-att_001

The flashlight hack that has come to light (pun intended) recently does not include the light that comes with the Iphone.

If you must have a different flashlight than the one that comes with the phone, make sure it a small file. Large files could surely mean it's filled with spyware, tracking your location via GPS.

My advice is just use the flashlight that comes with Iphone. It does the job just fine.

In the early days of flashlights, the battery life was very short. So if you needed to use a flashlight, you would turn in on only for a second and then shut it off. Hence, the term flash-light.

The battery is defective, buy a new battery.

At first light it DOES sound a bit confusing.
First, the definition of the term 'NON-LUMINOUS'; 'Not capable of PRODUCING light but can be capable of REFLECTING light from another source'.
For instance, our MOON is NON-LUMINOUS as it REFLECTS light from the Sun. The SUN is LUMINOUS as it produces light that is REFLECTED off the surface of the moon. And so, LUMINOUS means capable of PRODUCING light.
Now closely examine your flashlight.
The BATTERIES produce electrical energy which is transferred to the BULB which emits light, thus LUMINOUS. The tiny little BULB emits quite a lot of light for its small size. However, the bulb is contained within a concave silvered cone which REFLECTS,(NON-LUMINOUS) gathers and channels the emitted light from the BULB (LUMINOUS) into a BEAM which ILLUMINATES whatever you are pointing the flashlight at.
Our cameras would be just paperweights if there were no NON-LUMINOUS surfaces for the light to REFLECT off of, back into the camera lens, onto the 'plate' thus etching the image. For example, take a photograph in the dark without the flash and what do you get. No LUMINOUS, no NON-LUMINOUS.
And so there we have LUMINOUS and NON-LUMINOUS, ILLUMINATING our lives. Enjoy! :)

Hold the maglite after 30 min charge if warm means charging , if cold no charging , test the light when so bright means very good.