The sony uses a pretty regular battery.
it's a 3,7V, 850mAh battery,with 2 leads (a + positive and - ground).
You'll need to open the device (after warranty),by unscrewing the 4 screws in the back,and slide out the internals.
the battery uses a plug that is similar to some notebook cpu fan plugs (2pin,usb).
The only thing you'll need to keep an eye out for is the sizes. Most portable camera's and cellphones have 3,7V and between 640-2500mAh,so finding a good battery online shouldn't be that hard.
Just make sure you connect the leads correct.
Haven't tried myself;but I think the process could involve soldering some wires to have contact between battery and the board.
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