Fenix BC22R, designed for city and road cycling, operates with a removable ARB-L18-3400 battery. This means that when preparing for long rides, you can purchase and fully charge a spare battery in advance and swap it in when the original runs out of power. The light can also be used on low and medium power settings while charging: if you manage to set up a separate power bank in a small frame bag, the runtime becomes truly impressive. On lower power settings, the BC22R can illuminate for up to 41 hours in favorable conditions (i.e., sufficiently warm temperatures). Check the additional image for detailed battery life information. The tool-free handlebar mount attaches securely to the handlebars, allowing the light to be easily attached and removed. The mount is compatible with handlebars with a diameter between 28 - 35 mm. - The beam is designed to reduce glare for oncoming traffic - Four steady lighting modes ranging from 50 lumens to 1400 lumens, with runtimes between 4