The battery does not last long. I say this because there is something to compare. I also have Haylou GT1 Pro and Haylou T15. If we compare them all, then in terms of battery life, Haylou T15 is better, but if you use them as a headset, they are bad, you can hardly hear you. In second place is Haylou GT1 Pro, they have terrible noise reduction and, as a headset, they don’t fit, callers can’t hear you at all. On Haylou T15, you could forget about charging the case for a week, if not two, with almost constant work. In terms of better noise reduction, Haylou W1 is better, as a headset this is the best option, but the case and headphones hold the least charge, with a constant work of 4 hours maximum. Compared with their Haylou GT1 Pro, in one ear Haylou GT1 Pro, in the other Haylou W1 landed faster than the second, two hours faster than the first. Haylou W1 takes a long time to charge, twice as long as Haylou GT1 Pro. You have to recharge every day. By the way, I wash myself in the shower with Haylou GT1 Pro headphones, but this will not work with Haylou W1.
Another minus, this one is not convenient to take them out of the case, you still need to get used to it.