By any chance, did you install any app that could be draining battery that fast? Otherwise, I think something could be wrong with your unit. Been using DX160 mostly for streaming in the last few days. From 4.4mm, wifi on, using Qobuz, streaming hi-res files with periodic screen on/off, and running virtual volume widget on top - I'm getting on average 8-9% battery drop per hr. Will do full charge and battery drain to zero tomorrow, to see how long it will last.
Based on what I'm hearing, DX160 has a very wide soundstage, even a little wider than DX220 w/amp1mk2, and also the sound of DX160 is more reference quality, even more transparent in comparison to DX220 with its stock amp. Another noticeable difference, tested with Andros and Solaris, and I can't hear any hissing even when idling or playing with volume down to zero, while with DX220 there is a slight "waterfall". A few people asked me how DX160 stacks up against M11 and R5, and based on what I'm hearing DX160 has improved dynamics and layering, and wider soundstage. Actually, DX160 more reference tonality kind of reminds me of LPGT.