First, the guy uses soldering irons directly on the batteries (2:22). This is extremely dangerous, applying heat to batteries can and will send them into thermal runaway.
Next, he's smart enough to use a "balance" board to equalize the cell charges. But it would be way better to deplete the batteries individually, and it would be even better to run each one through a grader to determine capacity - only use matching cells in a parallel pack.
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