Sony VGN-UX180P - Manual (Page 147)

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Troubleshooting
Battery
How do I find the battery charging status?
See Charging the Battery Pack (page 23) .
When is my computer using AC power?
When your 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 the battery power is still low after charging it, 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 your computer.