Sony VAIO VPCCW1 Series - Manual (Page 137)

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Troubleshooting >
Battery
Should I be concerned that the installed battery pack is warm?
No, it is normal for the battery pack to be warm while it is powering your computer.
Can my computer enter Hibernate mode while running on battery power?
Your computer can enter Hibernate mode while running on battery power, but some software programs and peripheral
devices prevent the system from entering Hibernate mode. If you are using a program that prevents the system from entering
Hibernate mode, save your data frequently to avoid losing data. See Using Hibernate Mode
(page 29) for information on
how you can manually activate Hibernate mode.