Remove the large white plug that connects the wires from the battery to the main board using your hands.

Pull the battery out with your hands.

In this case, follow this additional guide for pushing out the battery. Summarized: You can try to remove the other radiator, unscrew the charging port and gently pull it out just a bit so a large screwdriver's end - without its bits - can fit in and push out the battery from this side.