The Shimano STEPS BT-E8020 Battery is a high quality, long lasting integrated frame mounting lithium-ion battery pack for Shimano STEPS systems.  Shimano STEPS BT-E8020 Battery Features  In normal mode the riding distance could exceed 100 km Waterproof design as well as impact and vibration resistant 1000 charge cycles without significant power loss Approximately five hours charge time Charge level display with error signal info and on/off switch Charging port Lock system for off bike security High 500Wh capacity (36V, 14Ah) Average weight 2650g About Shimano STEPS A system with components that cater to everybody’s needs and delivers ultimate performance and reliability. That’s the heart of the matter. With SHIMANO STEPS you’ll push boundaries and feel energized while doing it. Whether easing past traffic to get to work or school, enjoying a healthy outing or doing errands, SHIMANO STEPS will get you there relaxed and refreshed.