Well I answered my own question. The cold does seem to affect the battery. If you see my last post the battery was being throttled by the BMS I think. During the last week the weather turned warmer and I had no problems. Yesterday the temperature dropped below -3 C and the same problem occurred. It he battery is left outside all day at work in these temperatures it seems to start cutting back to half power on the way home. I guess the solution will be to take it in to my office during the day when it is this cold. Or stop biking.