It may seem obvious, but the red and green lights on your Milwaukee Tools hard hat light are, more often than not, an indication of the lamp’s battery life. It’s probably even more obvious that a green light indicates a healthy battery, and red indicates one that needs to be charged as soon as possible.
According to the instruction manual for Milwaukee’s hard hat headlamp, the green and red lights indicate a specific level of battery life. Per the manual, a solid red light means the light’s battery charge rests somewhere between 10% and 25%. If the red light blinks, the battery power has dipped below 10%, and it’s time to find a USB port to charge your light. On the green light side of the equation, solid green indicates your battery is 80% to 100% charged. While there is no blinking green light indicator on your headlamp, according to Milwaukee, when your battery power ranges between 25% and 80%, a solid orange light will show.
The lighting system is essentially the same while the headlamp is charging. But it should be noted that the colors will blink while the hard hat light is charging, with a solid green light popping on when you’re at 99% to 100% charge.
