How much do I have to pay extra for the same audio quality (I'm using an ATH M50 I bought for 100 bucks) and how often do I have to recharge it? Are the batteri

How much do I have to pay extra for the same audio quality (I'm using an ATH M50 I bought for 100 bucks) and how often do I have to recharge it? Are the batteries replaceable? The cable problem almost went away when I switched to a coiled cable, I really would gain little to nothing with going wireless, specially when accounting for the extreme nuisance that is having to worry about the battery of yet another device.