Sony SVT11213CXB - Manual (Page 205)

Some apps sense the pressure of the pen and will change the thickness of the pen’s line
accordingly.
Replacing the Battery of the Pen (Digitizer Stylus supplied models)
Replace the battery when the pen (Digitizer Stylus) begins to function incorrectly.
Based on usage of approximately 4 hours a day, expect to replace the battery every 18
months. Use an LR61 (LR8D425) alkaline battery.
1. Remove the Tail cap from the pen, then remove the battery.
2. Insert the battery into the pen with the + side toward the nib.
3. Reattach the Tail cap.
Note
Do not remove the Tail cap except for when replacing the battery.
If you do not intend to use the pen for a while, remove the battery.
The pen should not be used with a commercially available rechargeable battery. Using a
rechargeable battery may result in battery leakage and malfunction.
When the battery power becomes low, replace with a new battery promptly. Keeping a
depleted battery in the pen may cause battery leakage.
Do not attempt to recharge a battery.
Refer to the supplied safety manual.
Using the Pen Hook (Digitizer Stylus supplied models)
By using the pen hook, you can carry your VAIO computer with the supplied pen (Digitizer
Stylus) attached to the computer.
1. Attach the pen hook to the hole ( ) on the back of your VAIO computer.