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...
Shimano - Battery Charger - PC Linkage Device For the charging on internal SHIMANO DI2 batteries (BT-DN110), the SM-BCR2 also serves as a PC linkage device for E-TUBE PROJECT firmware...
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