Okay, I don't know the difference between the i6 and i5 controllers.
I suspect one that you have is i5? But how can Amego have 18A max current?
Also I don't know the max current rating for the Magnum CT5-i6.
The Magnum is a little more expensive at $119 US, compare to $129 Canadian for Amego.
Magnum CT5-i6
48V Das-Kit controller with integrated pedal assist sensor (PAS). This part requires advanced knowledge to install safely. For questions regarding compatibility or installation, please contact Customer Support through the website chat or call 323-375-2666.
www.magnumbikes.com
Amego CT5-i5
This is a replacement controller for Amego Infinites, Elevates, and NCM Moscows and Aspens. It is 48V sine wave controller with 18ah.
www.amegoev.com