Ride brilliantly. The heart of the SmartSense system. Primary battery for SmartSense Enabled and Compatible bicycle or carry as backup/spare for longer rides. Where it thrives On the bike, off the bike What it's built for SmartSense Highlights USB-C rechargeable, cable included, battery size: 19.4 Wh / 3-20 hours of run time (configuration dependent). Off-bike accessory charging Specs Details Platform Battery Model Name SmartSense Garmin Varia Core Battery Model Code CP1552U Please note that, based on component availability and other factors, specifications are subject to change without notice.