On Using Headphones - Sony VAIO PCG-FR Series User Manual

Precautions
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Keep the battery pack away from all sources of heat.
Keep the battery pack dry.
Do not open or try to disassemble the battery pack.
Do not expose the battery pack to any mechanical shock.
If you are not using the computer for an extended period of time, remove the battery pack from the
computer to prevent damage to the battery.
If, after fully charging the battery pack, the battery power is still low, the battery pack may be reaching
the end of its life and should be replaced.
You do not need to discharge the battery before recharging.
If you have not used the battery pack for a considerable amount of time, recharge the battery.

On using headphones

Road safety – Do not use headphones while driving, cycling, or operating any motorized vehicle. It may
create a traffic hazard and is illegal in some areas. It can also be potentially dangerous to play loud music
while walking, especially at pedestrian crossings.
Preventing hearing damage – Avoid using headphones at high volume. Hearing experts advise
against continuous, loud and extended play. If you experience a ringing in your ears, reduce the volume
or discontinue use.