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Is 200% lighter half as heavy, or is it buoyant? Cause 100% lighter is weightless. So 200% would be a negative weight. I am just confused.

You are correct, the link to powertechsystems.eu has those erroneous percentage calculations.

The back of my envelope says that a shipping container full of Li-on batteries would weight 192.5 tons at 2.5 kg/L compared to the maximum standard load of 30.5 tons. So it would have to be mostly empty. I don't think that makes it infeasible, though.

40kg for lead acid equals 13.6kg for lithium so that's 66% lighter.