Originally Posted by
Bunyanderman
Making it easier to swap out batteries, since they are detached in seconds. They are heavier than the derailleurs them selves, I would look into a race day battery.
I don't really see it worth the effort. The current batteries claim 600 mile range.
On the type of race where a tiny bit of weight savings might be of concern, i.e. long hilly road race, you'd want a fair amount of capacity. So you're "race day battery, you'd still want to cover 100 plus miles racing, plus a warm up, and have a good safety margin built in. I don't see such a battery saving even half of the weight of the normal battery.
The entire rear battery weighs 24 grams, can't find a weight for the front battery, but assume even 50 grams, a race day version of both batteries might save 20-30 grams or an ounce give or take.