I would agree that the 'drive train noise' on your I2 is a good bit louder than any of our three - We have an 80 mile machine, another with 900 miles and the one I ride most often has about 2300 miles. All of them are quieter than yours
As to the range on those old batteries - 5 bars left after 7 miles isn't too bad, considering you did most of the ride at or very near top speed. Like any other battery powered device, it will get better 'mileage' at slower speeds. You ride much differently than we do - Maybe only 10 or 15% of our miles are done at top speed
You do have to keep a close eye on the width of the machine - I would venture to guess than 95% or more of the tumbles taken off Segways are caused when one wheel encounters something which impedes it's ability to turn like it wants to. The machine can't balance unless it's able to do what it needs to do with both wheels. Not something you have a problem with so much riding a unicycle I would imagine
Glad you got it up and running - Love your videos! Are you using some sort of steady-cam device?
Don
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