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Shimano said about a thousand miles depend on how much you use it, annoying thing about Di2 is that they don't sleep (unlike eTap).
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You plug a USB in to the junction box under the stem. It takes about 45 minutes.
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USB cable into the junction box at the stem.
I've never run it down - reviews say at least twice as long as eTap 2500k+
I charge it before big races.
edscoble
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hippy
@MechaMorgan
How often do you need to charge Di2, and how do you charge an internal battery? A long USB cable or?
Not trolling I just don't know.