A backup battery provides power to a system when the primary source of power is unavailable. Small backup batteries may be primary cells; rechargeable backup batteries are kept charged by the prime power supply.
Shimano's EW-SD50 E-TUBE Electric Wire is designed for external routing and helps you power your bike with ease. The high-efficiency wire is made from the latest in Shimano cable technology...
Shimano - Junction B - E-Tube - Internal DI2 Wire Routing - 4-Port For internal DI2 wire routing, Shimano's SM-JC41 Junction B is the central connector for DI2 systems. Wires...
For CubiCubi Lighthead
Cartridge battery
850 Lumens / 3000 mAh battery
Charge phone and other devices with a USB charge cable
Recharge via a micro-USB cable.
SKU# TCB-CB3000