Sony VGN-FW170J - Manual (Page 136)

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Troubleshooting
Battery
How do I find the battery charging status?
See Charging the Battery Pack (page 25) .
When is my computer using AC power?
When your computer is directly connected to the AC adapter, it uses AC power, even if the battery pack is installed.
When should I recharge the battery pack?
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When the battery level falls below 10%.
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When both the charge and power indicators blink.
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When you have not used the battery pack for a long period of time.
When should I replace the battery pack?
If the battery pack quickly runs out of power after fully charged, it may be reaching the end of its life and should be replaced.