How do you charge a Lezyne bike light? Lezyne bike lights are charged using a USB-C cable. Simply connect the light to a power source, such as a USB port on your computer or a wall adapter. Most models feature an LED indicator that indicates when charging is complete. What is the battery life of the Lezyne lights? The battery life of Lezyne bike lights can vary from model to model, as well as be determined by the brightness setting. On lower settings, some lights can last up to 15 hours, while on maximum brightness, runtime typically ranges between 1.5 to 4 hours. You can check the individual product specifications for exact details when you click through to the product page.