Well I just bought it knowing I would need this as an option. Yes I'll hunt for a AC charger first but if push comes to shove, I would need to charge from a Tesla charger. When riding with a friend or even alone I can gauge how far I can go with my AH battery capacity however if I'm in a group ebike ride going 40-80 miles, then I would need to find a charging place anywhere I can charge whether its a AC outlet somewhere or a Tesla charging station close by. I do use a slow charger for at home neighboring rides using 60% of the battery by not charging over 80% and not using below 20% but riding with ebike group rides I charge it 100% and drain it to 0% plus I would bring my fast charger (4amp) with me on these group ebike rides.