where to find an ho alt or to just try and run 2

[ScionIq]

I drive a 2012 scion iq . My stock alt is 100 amp buy I wanna run a back battery. I have looked around and can't seem to find an ho one anywhere. If I can't find one the only thing I can think to do is run a second alt / how do I go about wiring it aside from a wire from it to the back battery.or is that it

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