I never kept my batteries below 50-60% lol! Unless I have to, which is super duper extremely rare. I am always impressed by the battery on the Dx300 though, going 7-8 hours and only %40 down with %60 remaining. It is pretty crazy
When I want Dual Korg tubes, and other sound signatures, Toss a C9 at the Dx300 and observe the performances being taken further: Most importantly, the signature is more neutral than listening direct from the dx300, still warmth though, but improved soundstage, deep sub bass, imaging, dynamic, textures, and extensions are all taken further.
Yes, the Dx300 is benefited by the dedicated battery for the amplifier alone, which is totally independent from the main processor and DAC Vs other DAPs.
change up the sound signatures here and there is pretty fun stuff LOL, expensive too