For the maker. But the hours per charge do swing wildly. The usual issue is you get less than what they tell you. This is either they fibbed or they were running it in the most economical way possible. Very low volumes. Push up the volume and I bet you can see a 10 to 1 reduction in play time.
As to plugged in all the time, a GOOD DESIGN is fine with that. But maybe designs are cheap so you are never sure.
I only found mention of 25 hours of battery time from a 650mAH battery. And since the volume and content matters, 8 hours may be correct.
Just received a pair of Bludio Victory Headphones, with utilizes 12 drivers (6 per side) with An Optical Cable input on the headphones.
It states that I should get up to 40 hours of using Optical only. I fully charged them before using them, and plugged them into the optical output on the back of my computer, with Blutooth power switch OFF. I only got a MAX of about 8 hours of total usuage! Which maybe I'm not understanding how the headphones utilize power? even though I only used them for 8 hours of gaming and listening to music, I did leave them plugged in to my computer, which runs 24x7? are the headphones using power even though no audio source is being used thru them, just from being plugged into my Optical out of the back of my computer ?? Or does that fall under standby which I'm supposed to get 1000 hours of usage ?