Is Knog a good brand? We think so. Knog is renowned for creating simple, yet highly-practical bike accessories and rechargeable LED bike lights that you can rely on. How do you charge a Knog bike light? Knog bike lights are designed for convenience and practicality and most models feature built-in USB connectors. Simply plug the light directly into a USB port on a computer or wall adapter, no additional cables required. However, you can check the individual product specifications for more details on charging.