They go loud but not LOUD My phone had 30 volume steps and I’m around 27/28, so not a lot of room left, but that’s plenty loud and 30 is almost unbearable.
Battery life is rated at 7 hours for the buds, I use them for workouts so never more than 2 hours at a time before they go back in the tiny charging case. My phone gives an approx. rate for the battery of connected BT things and it goes down slowly so I think the official specs are pretty accurate.
They do aptX Adaptive which is a wonderful codec, basically aptX HD optimized for stability with no penalty to sound quality. Your Qudelix supports it as a receiver, question is, does your phone as a transmitter? The ZE3000 also support AAC and vanilla aptX.
yeah, I forgot to point out the benefit of aptX Adaptive in my review. Besides what you mentioned, Adaptive also is low latency, so watching videos or gaming should be no problem.