Is it only 4-5? I thought it was advertised for 6-8. But I forget and I'm too lazy to look. My PB2 knock offs get 6 hours or so.
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If you don't care about "no name brands" These
PB2 Knock offs are a better bang for your buck IMO. I have these and another pair that are practically the same that look more like the Beats ones and I switch off when one set runs out of power. But they are rated for 6-8 hours and I get about 3-4 days of work outs before I get low battery warning. My workouts are usually 1.5 hours long.
These are the other knock off ones I use.
What I like about these that are better than PB2 is that they have better sound isolation for the gym use. The PB2s hang loose on purpose so you can hear the outside world... these (both pairs) go into your canal a bit and block out outside noise.