The Shimano EW-SD50 Battery Mount is meant to be used with exeternal wiring kits and requires a firmware update to be compatible with Alfine Di2, XTR M9050, XT M8050, Ultegra 6770, Ultegra 6870 and Dura-Ace 9070 Di2 systems.
External battery systems are recommended for those who desire quick battery access, and easier battery swaps, for example riders who may be away from electricity for months or more.
Shimano EW-SD50 Battery Mount No PCKG Specifications
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