Battery needs to hold charge, they are even made of lithium (rare earth metal)....doesn't matter.
Opamp should be using silver instead. It is just because there is no manufacturer to make it, and specifically order it will jack up the price, and the price of x7 is non realistic to ask for it.
The PCB should also use silver as conductor and call PSB instead, again, price cost !
Ideally, everything inside a dedicated amplifier or signals that were processed by the DAC into analogue should be conducting the best way that it could.
But those topics are for another place. Now, my question remains.....people has the option to use high quality cables for interconnect from DAC to amplifier. By using X7 and amp module, there is no option to use high-quality interconnect. Therefore, will there ever be a limited run for those module with high quality Terminal ? I asked this because the amp module is taking in analogue signals that were dedicated to sound frequency, I wouldn't ask if it was carrying data signals