Check Your Battery Contact Clips: Rust & corrosion can fail the contact to the battery. Inspect both sides of the red and black clip. Replace damaged battery connectors.
Check battery lead Wires (Blue/Brown): Frayed & corroded wires can fail to make contact with the clip. Blue is negative, brown wire is hot.
LED Flickering: Your battery may be low on charge (or in failure). Use your vehicle battery to power and test the light performance.
Where Is The Button On Smart light? See image to the right