Sony PCG-Z1VAP2 - Manual (Page 18)

Frequently asked questions
How do I know when the battery is charged?
To determine the remaining battery charge, see Locating battery information.
When is the computer using AC power?
When the computer is directly connected to the AC adapter, it uses AC power, even if a battery is installed.
When should I recharge the battery?
 When the battery level falls below 10 percent.
 When both the battery and power indicators blink.
 When you have not used the battery for a long time.
When should I replace the battery?
If, after charging the battery, the battery power is still low, the battery may be reaching the end of its life and should be
replaced.
Should I be concerned that the installed battery is warm?
No, it is normal for the battery to be warm when it is powering the computer.
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