Same here with UAPP and Hiby RS6. Over 70% battery drain over night.

I experienced the same thing. The bass on the Bathys became much cleaner after a few hours of playing in. And deeper. I also lowered the 125 Hz and 250 Hz frequencies in the poweramp app, and for me the sound is even cleaner. With the flat EQ, the bass blurs the mids a bit, which I don't like...

No, dont't have Qobuz. But meanwhile, I managed to play music from the UAPP app, including volume control. Before, IF there was music audible, only in max volume. Not adjustable. But I had to reset the app, so it would initialise the Bathys again. Still no sound in USB-C mode with Tidal or...

It works, I think, with the Hiby or the UAPP-Player, but not with Apple Music. But I quit that service anyway.

The LED is off even in cable mode. That's great :-)

If I want to connect the Bathys with my Hiby RS6 by cable, I have to use the 3,5mm cable. USB-C not working either.

No, I don’t really think. And same as you obviously do, I have no other explanation for the fact, that the DAP plays louder than the iPhone

The DAP is much more powerful as the iPhone (max. volume on iPhone means ca. 70% for my Hiby RS6). This is one of the reasons, why I listen with the DAP and not the iPhone. And the DAP has 100 steps in volume, so finer adjusting, more storage doesn't cost a fortune and most important, aptx...

Same here. I feel like they are sounding better with every new day. Even the ANC became better and the soundstage wider. No explanation for that.

The Hidizs works too for iPhone... https://www.hidizs.net/products/hidizs-iphone-otg-adapter

Bang&Olufsen first comes to my mind here…

Can not confirm that. LED switched off in App, in wired mode the LED turns on.

Additionally they‘re significantly louder in BT-Mode when the source is a DAP (Hiby R6 2020 here) compared to the iPhone (13Pro)

I can confirm your last question, I wish they could play louder.