Sony PCG-GRX690P - Manual (Page 17)

Using the Battery
17
3 Push in and lift up the battery bay cover until it clicks into place.
Using a second battery
To insert a second battery
1 If another device is in the multipurpose bay, remove that device.
2 Insert the battery into the multipurpose bay. When the computer uses the
second battery, the Battery 2 indicator turns on.
Removing a Battery
Inserting the Second Battery
Battery
Multipurpose bay