Hi,
The battery part is easy, it's a safety feature put in by Sony to help reduce battery degradation.
To turn it off:
- Start
- Type in "Vaio Control Centre"
- Open it up
- On the left sidebar click on Power management --> Battery
- Untick "Enable battery care function"
You can change settings in "Advanced settings" if you choose to use this feature.
I may be able to help with the Bluetooth issue, not sure about the Blu Ray though since I've never used one. Off the top of my head, update driver / make sure the Blu Ray is from the correct region?
Can you provide more information about the Bluetooth issue? What happens when you type in "Bluetooth" into Start?