I bought some Sony WF-1000XM3 a couple of years ago. They were new, although heavily discounted, but the battery life was awful; the box says the buds themselves would last for 6 hours on a single charge, right? I got maybe 1.5 hours out of them.
Sony wouldn’t RMA them because I supposedly bought them at their outlet store (I didn’t). Eventually, I just replaced the batteries in both buds and now they last ~3 hours; I guess that’s due to the battery in the charging case also being weak.
Next time I’ll just buy one of those Fiio bluetooth DACs to use with my Grados…