The battery on my seven year old, lightly used Haibike doesn't show signs of deteriorating yet. I'll try it out today, but the last time I rode on some pretty steep trails, it used only 10 wh per mile.[/QUOTE]
Today I rode my Haibike hardtail 15.5 miles (road, bike trail and off road; some hills which are hard to quantify; speed 10 mph - 32 mph; no wind; 230 pounds between me and the bike); used 36% of a 396 wh battery, so 143 wh or 9+ wh/mile; not too bad since that means about 40 miles on a charge.