Article ID : 00072535 / Last Modified : 02/19/2014

Battery is discharging when VAIO is turned off

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Your VAIO will use some power, even if it is completely shut down. This is per design and does not indicate a malfuction.

The two main reasons for discharging are listed below.

1. Certain PC components require sustained power to maintain operability, including for example:

  • RTC (Real Time Clock), i.e. the mother board embedded clock, to keep date and time settings
  • EC (Embedded Controller), i.e. the mother board power controller circuit, to control ON/OFF function and power saving features
  • BC (Battery Controller), i.e. the battery pack microprocessor, to monitor the battery condition (charge level, temperature...) and to ensure the communication with the VAIO

2. Lithium-Ion batteries continuously gradually discharge, even if the battery is not physically connected to the VAIO.

The battery self-discharge rate will depend on the age and condition of the battery. Older batteries will discharge quicker compared to new battery packs.