The outcome if the "Battle of Los Angeles" aliens came to China would be as follows.

1. They found the sewers in China were too small and narrow for them to get in, and they could not go back to the sea to recharge. Oh no! Finally, they fainted in the streets due to physical exhaustion, and their bodies were picked up to smelt steel.

2. After getting in, they found that the sewer was a shoddy product, with all kinds of rust and decay. Finally, the water pipe burst. Oh no! The aliens were buried underground.

3. They were blocked and poisoned in the sewer.