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I have the same motor and similar batt (frame bag) 20 amp batt. Well i think we defenetly need to upgrade the firware to give it more life.There is plenty on the subject,,a bit complicated but in the long run it worth it i think.

I am building a new e-fatbike with Tongsheng tsdz2 48v 500w with 100mm b/b widht,,,,,OUPS did not fit my frameneed a 120mm so i put it on my wife trike. Nice install with the 20amp batt on the side frame. The 120mm is on is way with a new 20h batt in a soft bag for a better attachment between...