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Glws
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.