12 volt /5 amps off mains vs 12 volts/3 amps off battery power for mini-amp?

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So I'm running a 30 watts/8 ohms mini-amp off a battery soon and wonder if it will affect sound with less amps coming from the battery ?

12v/5 amps mains vs 12v/3 amps battery.

It is to power ortho/planar headphones 50/60 ohms which are relatively hungry for watts vs dynamic headphones.

The mini-amp powers the headphones at loudest I can listen at about 50% full volume.
Will I just need to turn volume up to 80% etc off of battery power or is it not that simple ?
 
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