Both my wife and I bought the same bike at the same time and have the same mileage on our bikes. At the outset of our trip the other day she had a range of 65 miles in Eco mode and I had 47 in the same mode. My guess is it's because I'm 50 pounds heavier than she is but I would like to test my theory and switch batteries to see what my computer tells me, after riding with her battery? Will my computer continue to show the same higher range with her battery or will it sense that it's working harder and show less range? I know the computer monitors the battery use, so my concern is if I will be screwing anything up by switching them around for the test?