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If only there was some system available which didn't need wires and mounted the battery directly on the dérailleur...
gbj_tester-
SRAM? Don't know enough about it to dismiss it totally but I already have plenty of experience with Di2 and know it works well, have existing parts for Di2 and I don't need to be carrying MORE spare batteries for a ride and their charging dock. I feel dirty enough just using one of their cassettes...
hippy
I've never swapped cranks or BB on that bike so don't know if there's a hole from seattube to BB shell. (I'll read this: http://forums.roadbikereview.com/specialized/converting-di2-specialized-owners-318129.html)
SM-JC40
http://www.wiggle.co.uk/shimano-dura-ace-9070ultegra-6770-di2-wiring-junction/
What about a fork steerer mounted battery? That possible? Easier/harder? I could ditch or cut the top cap to allow cable to pop out the top, then it's near the stem-mounted Junc A box but I guess I'd then need to locate Junc B somewhere still and it requires a long cable run probably down the downtube.