Battery, How do i know when the battery is charged, When is the computer using ac power – Sony VGN-BX500 User Manual
Page 164: When should i recharge the battery, When should i replace the battery
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Troubleshooting
Battery
How do I know when the battery is charged?
To determine the remaining battery charge, see Charging the Battery Pack
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?
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When the battery level falls below 10 percent.
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When both the battery and power indicators blink.
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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 the computer.