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It came with the bike / new out of the box. I guess they tested it fairly rigorously in the factory? It's fine now so just came empty.
I'm more interested in the Garmin connection to show battery & gear but also interested in ability to update firmware or customise shifters as I change my cassette every now and then.
The battery should come with more than 1 ride's charge. Did you buy it new?
What for?
Hooking up to a Garmin makes more sense.
http://www.cyclingweekly.com/cycling-weekly/new-dura-ace-lets-wirelessly-control-garmin-shifters-307634
https://forums.garmin.com/forum/into-sports/cycling/edge-1000-aa/64778-