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So do I, all the time. Because all my spare brain cells (the two of them) are dedicated to arguing with people on the internet not remembering that bikes these days, unlike the last 30 years, need plugging in now and then.
I don't mind half a commute riding the Kinesis singlespeed but half an audax is a bit shitty. That's why I tend to leave the Di2 charger, battery, USB stuff in the bags. If I forget I can ride and charge, no drama. That's why I don't like the bar end junctions.
You're assuming there was somewhere to charge my batteries where I stopped.
As it happens I didn't charge the battery intentionally to see how long it would last.
But you ignored the more salient point that people forget to charge Di2, especially sleep deprived people in the middle of ultra races.