This battery problem in the cold is a red-herring as far as E-Bikes go... IMO. Why...??? Because you can take the battery inside and charge it over night, and when you get to where you want to get to you can take the battery inside and charge it, before you go home... Thus, in general the battery is at room temps and will perform like normal... Now, if you leave the battery outside all day and all night, there will be some loss of power/performance/penalties for doing that, how much depends on the temps and the size of the battery.... It is the way it is...