New Hacker Gadgets Dual 21700 Battery Holder

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@John_Simmonds

I wonder if these will help with the noise coming from the speakers after the batteries reach below 50%

you can try it:

Audio noise when low power workaround

It seems the issue is power saving mode on linux, at least for ubuntu, turn off sound card power saving. There should be similar settings for other distributions. For Ubuntu, edit the file: sudo nano /etc/modprobe.d/snd-usb-audio.conf Add the following content: options snd_usb_audio power_save=0 Save and reboot. No noise on battery less than 15%, no noise on less than 10%.