Thus to cover a commute of 40 miles (65km) we would suggest you need at least 450Wh. The big Wispers (at over 540Wh when tested) and our big beast (over 600Wh when tested) would meet that need - but not many others on the market I think?
That's my experience too, only the latest 260 Wh Panasonic unit equipped bikes can get near with some sparing power use, due to the strict software control and system demand for rider contribution of at least 50% in standard power mode.
The short answer is you need more battery stamina than you might think - and in the cold, or after a years use, that Wh will drop by perhaps 25%.....
Yes, most forget the decline in capacity with age and temporary loss due to low temperatures.
.
