Bought this in 2019 as an open box item. Replaced the battery in late '20. Just tested it, using a Hiby R3 with a collection of CD-quality files, through a pair of pair grado style phones (Ellevenes R1 drivers) turned up to a pretty loud volume, got exactly 6 hrs 48 mins out of it. (Not including the R3 in the sale, just the box and cable as shown)