I have one question with problem of changing external battery on longer trip
I have ES4 un-activated going max 27Km/h
with external battery i normally rode about 24Km
with internal battery only about 18Km
today i'v tried drain internal battery to 0% than i connected External fully charged and rode another 10Km then scooter starts to braking like have not enough energy and ext.bat has still 50% capacity, i changed again ext.battery to new fully charged and rode to home next 6 Km with normal functions
What experiences with changing external batteries do you have and how it relay works for you?