36v 30ah vs 48v 20ah for range

Ty for your reply I don't mind what ever method I use has long has the both batteries can get me 30 miles or more I'm hoping I can get that range over them
the age and condition of your batteries as well as bike mass, your mass, any cargo?, terrain, and your comfortable level of input plus a few more factors all contribute..

A reasonable test would be to see how far out you can ride on the 13ah, carrying the 17ah battery with a safety overhead to get you back.. if you make 15 miles, (edit or close to 15miles..;) ) i think your ok
 
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