Single 0 gauge wire to secondary battery?

[Lacinaround]

I’m going to run a second battery and was wondering if it was ok to run a single 0 gauge ofc wire to it then run 2 positive wires from the battery to the amp. If I calculated correctly it’s going to be at 640 amps. Would that hold up or would I need 2 0 gauge wires? System is 2 massive hippo 2k rms 15’s and a md8000.1 taramp wired to 2 ohm so it will be at 6k rms.