Re: You will need
2 Bluetooth will eat the "Small" battery this thing will be able to hold in a very short time if its more than an interface for your ithingy.
really? the batteries in my bt earphones (considerably smaller and probably cheaper than the battery apple would put inside an iDevice for the wrist) last 3 days easy.
Can you get BT earphones rather than headphones, with sensible battery life?
yes, mine last at least 3 days, could be longer but i'm in the routine of charging them on wednesdays and over the weekend. which isn't a problem as i'm already in the routing of charging my phone every night.
Also even if you're right, BT earphones would be the reason they cost £150 so he's half right.
No, bt earphones for £150 is so 2008! you could have just-f'ing-amazon'd-it to check your prices before you typed, but i've done it for you:
On just the first page, showing 16 results, there are 9 items that i would consider "earphones" and of those, only two cost over £35.
Adding up the number of people who left reviews (good or bad) comes to 635 people. Even if you take the unlikely view that I'm the only person who bought a pair and didn't leave a review, that's still quite a lot of people for a product that "nobody wants" as you put it.