Somehow my V20 is still trucking along on the original battery. I've been considering an upgrade, but it appears that LG has departed too far from what I liked, which was the great DAC/Amp, and user-replaceable battery. The battery life was always garbage so I'm investigating a bigger replacement on amazon (suggestions welcome!). However, if another LG Vn0 phone had been made with a replaceable battery of substantially higher capacity and same/similar sound signature and SQ, I would upgrade to that. Too bad really.
Personally, I still use PowerAmp - the beta version that finally added Hi-res DAC output support. It's a little weird, because I can only make it up-sample everything to 24/192, but my few hi-res tracks are at least actually using the hires DAC now. Regardless Poweramp on the V20 has always sounded great on 16/44.1 - flat as a ruler and detailed AF.
Edit - Oh yeah, I finally upgraded to a 512 GB card, so now I finally have my entire lossless collection on the phone completely filling the card. Sadly that's still not enough room to also have all my MP3's on the phone that I have not replaced with lossless files, because that is another 400-500GB ... lol