Sony Vaio PCG-GRX315MP Instruction & Operation Manual page 25

Using your notebook
Inserting the second battery pack
To insert a second battery pack, proceed as follows:
1 If the weight saver or the optical disc drive is in the multi-purpose bay (1), remove it.
2 Insert the battery pack (2) into the multi-purpose bay.
The battery 2-indicator light turns on.
3 Attach the weight saver (3) to the computer to stabilize the battery pack.
4 Slide the eject lever on the bottom of the weight saver toward the front of the computer to lock it.
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If you attach two battery packs, you can remove one of them without shutting down the computer. When removing one battery pack, make sure that
the other battery pack indicator is on. If the indicator of the battery pack you are going to remove is on, right click the battery icon in the system tray
and click the Switch Discharge Battery option.
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