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Shimano Dura-Ace Di2 SM-BTR1 Battery

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Features • Compatible with Ultegra and Dura-Ace Di2 systems • Long battery life (up to 2000km when fully charged) • Available for external or concealed mounting • A single-wire E-tube connection and new junction units for a cleaner look and easier installation • Electric wires (SM-EW50) available in a range lengths from 150mm to 1400mm • 3 and 5 port junctions for cockpit area available. 5-port includes wireless unit • Special PC interface (SM-PCE1) for system diagnostics and customising the system