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https://www.gribble.org/cycling/power_v_speed.html
a) 75 + 15kg, defaults, 80W = 22.76kph
b) 75 + 15kg, defaults, 75W = 22.12kph5474k
a) 240.51
b) 247.47~7hrs better off at the end of IPWR without a dynamo. That's IF you ran the dynamo 24hr/day (which I don't), not taking into account any extra weight of batteries and critically not factoring any charging delays.
hippy
Agree with @hippy's point about one less thing to think about, there is a bit more stress with batteries. There's also a little bit more bulk if you are really short of space, and a bit more hassles if it rains to keep stuff dry.
But I think the gains are bigger. Those articles aren't written with ultra racers in mind. The power output for most of us is lower, after a couple of days, so losing 6 W when you're only putting out 80W is more damaging.
But even on those numbers, 6 min per 100km is 5.5 hours, or 100+km, so still worth having. (It's an autumn ride so quite a lot of dark, + gadgets, means people with dynamos would use them most of the time).