@FiiO if we want to get the most from our battery, what are the best things to do: turn off (or dim) screen? don't use equaliser? don't play anything higher than FLAC from ripped CD? use low gain? listen @ < volume 80? don't use Bluetooth or wifi?
Will using X5-3 USB DAC be neutral or even positive charging? What about having it on charge whilst using BT / WiFi - will it keep or even gain charge?
Can you quantify any of these actions just to give us a rough guide, like screen on full brightness will drain battery in N1 hours; playing 96/24 uses X times more battery than 44/16? Etc.?
Are there any background system processes that are consuming significant battery life that might be considered 'optional' that we could automatically switch off via a new settings option in future FW? This way, the non-technical / risk averse amongst us don't need to fret about "rooting" and stuff like that to obtain "Longer Battery"?