Sony PCG-GRX500 VAIO User Manual page 36

To insert a second battery pack
1. If another device is in the multipurpose bay, remove that device.
2. Insert the battery pack into the multipurpose bay.
If the battery is being used, the battery 2 indicator turns on.
Second Battery in Multipurpose Bay
3. Attach the weight saver to the notebook to stabilize the battery pack. See
information.
Using Weight Saver for Second Battery Cover
Keep the battery pack in the notebook while it is connected to AC power. The battery indicator flashes while the battery is
charging. See also "To charge the battery pack" in the printed Quick Start for more information.
Using the Weight Saver for more
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