I have been through many pairs of these shoes and the model they replaced too, for many years now. I actually prefer the 5mm drop and could probably go right to zero. I have not tested it straight, but I would say I have over 6 hours on it and still have over half battery. I would return them if I could. the soundstage opened up, and details emerged from the fog, compared to the g4. The sound is ok. Blah! Sturdy Order your true size, or size up of your a half size. Needed leather footbed/insole to minimize calluses (plastic causes that).