Sony NWZ-E384 DEAD, waiting for a new battery

[cela]

I wanted to test the release candidate with Sony NWZ-E384    but the device doesn't charge it stays on 0% all the time, if I unplug from the USB
it shuts down very quickly. I'm pretty good at soldering so I have ordered a new battery, gone for cheap one from China on a slow boat, for about $3.   

I'll let you know how I get on.

For the record the battery is 34mm x 50mm x 3mm.
3.7V 600mAh 303450 Li-Po Battery For MP3 on ebay.