Sony NS-WS623 is quite light weight. It weighs just about 32 grams.
Connect the USB cable (supplied) to the USB cradle (supplied). Then, attach the Walkman to the USB cradle.
Make sure to connect the terminals ( 1 and 2 ).
Hold down the button 1 for 3 seconds.
You will hear the startup sound.
When the Walkman turns on, the lamp (2) lights up.
No. Sony WS623 comes with non-removable battery.
Yes, it does have fast charging. Charge it for just 3 minutes and it will work for another 60 minutes.