What Causes the ‘Blink’ in a Flashlight?

Your flashlight blinks because the battery is running low. When you press the button, it turns on and uses up energy from the battery. If the battery isn’t strong enough to keep sending power through all the time, the light flickers or goes out for a moment. It’s like when you’re playing with your toys and your batteries start to die, your toy might stop working for a bit before it dies completely.