A few years ago I bought a Sony walkman/pedometer then put it away and forgot it. I found it last week connected it to my computer to charge it and upload some music on to it. Great, I then tried to turn it on but to no avail. It will not turn on at all. I have been led to believe that the rechargeable battery had died through not having been used. Am I supposed to throw this walkman away or can I get a replacement battery?