Do I have to run the amplifier ground wire to the battery as well?
No!
The preferred method for grounding an amplifier would be to keep the ground wire as short as possible (assuming the vehicle allows this), and connect it to a clean bare metal point on the vehicle. Running the ground wire to the battery actually increases the chances for system noise, and can cause more grief than you'd expect.
The recommended way to ground your amplifiers is to keep your ground cable less than 18" long, the same exact size/gauge as the power cable, bolted directly to a solid, thick steel part of the chassis which is scraped and polished clean of any paint or primer for best possible grounding.
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