We believe that every piece of gear on an electric bicycle should handle the rain. In practice, that hasn't always been the case, and we've seen a few expensive eZee lithium batteries meet an early demise from water saturation corroding the BMS ciruit and leading to cell self-discharge. So it's been fun to partner with Feathercraft, a local collapsible kayak company that knows a think or two about waterproof fabric, to make a cover. The Battery Bootie has a velcro flap for key access, and can still allow the battery to slide on and off both the eZee rear racks and our CNC Twist Rail products.