Sony Ericsson MPS-70 Speakers

I got my Sony Ericsson MPS-70 Speakers with my w200i. I think they are good for general listening, but I just don't expect too much from them ( e.g. deep bass, great sound stage etc. ). But it doesn't mean that they sound bad either. The sound quality was just a bit above the average but what would I expect from something that cost me not more than a ipod shuffle. One thing i must tell you that I can't use them for much longer as it drains the battery of the phone very quickly. I tried to change my phone from w200i to w760i, but got mere extra 7minutes.