The new Bosch active line plus motor with a 500wh battery paired together on a fair few different makes of ebike seems to provide the longest range of all the crank drive motors currently available but is not the most powerful.
The good news is this battery and motor can be found together at around £1750.
When you are new to electric bikes it is easy to assume the ranges quoted by manufacturers must be accurate, but once you have owned one for a while you start to understand how many variables effect what range you personally will achieve and these include things like temperature, fitness, weight, gradients, tyres and quite a few more.
Generally the ranges quoted by manufacturers are unrealistically optimistic for very many riders.