I have done this already, I said that the batteries both work well but I haven't used them long enough to run them down so don;t know what duration they are good for. I only use the radio occasionally. So far I amm wery happy.
the difference between the real thing and immitators is immense, I have tried several 'own brand' etc. and there is no comparison, it's worth paying the little bit more for something that fits real humans.