I'm not too crazy about this idea:
"Internal EPS battery that mounts to the inside of the seat tube and is held in place by bolts that pass through the water bottle cage and bolt on from the outside. Charging takes place through hole in the frame and the charging port is fastened with some very basic looking nuts. This means drilling a hole in your frame and voiding your warranty. Some manufacturers are going to be offering EPS ready frames in 2014 but at this time it's only Pinarello that we know of."
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The rider in my avatar is David Etxebarria, not me.