There is no inverter, only seperate ground so it is L+, R+, L0, R0 and not L+, R+, L-, R- as a true balanced would be but sound wise it gives most of the benefits of balanced and is really worth it going trrs on your phones if you can
1% is when you don't use the unit at all and it is not in 24 hours but over night. I browse for albums and then play an album end 2 end. This way I get about 25 hours play time (about 3 hours per day) and charge once a week
For me the play time per charge is a major draw, I was so fed up with having to charge every 2 days with my previous daps and since I almost exclusively use it with JH13 the power is more than plenty even with an EU unit.