Upgraded massimo e-14 top speed run 

Great videos! I have this same bike and I'm looking for more torque and about 7 miles per hr more. Since upgrading the controller only gave a couple more miles per hr. Do you recommend running a dual 48v 20amp with the stock 48v and a battery blender or adding a 52v 20 amp battery? Im looking to spend less than $500 total and would like to keep stock controller and motor if possible.

Could you show me the link to the controller you bought please?

👍✌