Just back from 40 mile ride that took in ascent and descent of Mt Ventoux and used up 2 batteries. Mainly on Tour mode (Bosch 2nd out of 4 modes) with a bit of Sport on the really bad bits. Going uphill for 14 miles or so is clearly hard on the battery :-(. Max 39 mph coming down as it was very windy and also busy. The best thing I saw was a man riding a unicycle all the way up !! Don't know how he would have got down though..... Casualty - 1 rear spoke a mile from home. Lucky it didn't go on the descent.