it's not that good, methinks,
I've never had the need to reload after one day.
for whatever it is worth I recharge the thing twice a week, and it last at least two hours of listening time. I dont have regular listening habits, so this might close as much as to five hours, but there are days I don't use them at all.
they are pretty solid bettery-wise IMO.
I'd give a lot to have pair several devices though