To access the internals, please read the following article first:
How to: Access internals of your a1600 Corsair Voyager Laptop – Corsair
To remove the battery, you will need to remove four screws first (highlighted below) and disengage the connector to the motherboard
Tools required: PH1 screwdriver
After removing the screws, moving up the highlighted flap will reveal the connector. To fully free the battery, this connector has to be grabbed by its tab and pulled up toward you
After accessing the connector, grab the plastic tab with your thumb and index fingers and pull up toward you with slight force
Note: To reinstall the battery, make sure you press down on the connector, and not slide in from the bottom
An example of the battery removed from the system shown below: