Battery won't charge.
I just figured out the problem I had just like yours. I have three different sony MP3's and thought all the usb cables were the same. Well after changing out the usb cable my 438f started charging. I was using the cable from my s615f and the same is true if I use the 438 cable on the 615-full battery instantly. Also sony does not replace these batteries. If in warranty from purchase date, they will exchange with "like product" for $29, or repair yours for $77. Both prices include return shipping. http//eservice.sony.com
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