A big battery will weigh a ton and based on your 3 hrs charge/12 miles it would take a full 24 hrs to charge 100 mile battery. You'd need two at least if you were using it every day
Get Elon Musk on the case and get a Tesla SuperCharger adapter
Aren't above weight limits with 120kg of load,plus rider and other bits?
@Vince started
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A big battery will weigh a ton and based on your 3 hrs charge/12 miles it would take a full 24 hrs to charge 100 mile battery. You'd need two at least if you were using it every day