So, yes the IS a law that precludes importing goods that violate trademarks.
And where is Louis violating trademarks? He is buying batteries made by Apple from abroad.
No, he is
not buying batteries made by Apple from abroad. That's the entire problem.
Apple stopped making this type of battery long time ago because it is for an older model of laptop. What he has done is that he has bought some refurbished (or more likely aftermarket) but Apple-branded batteries.
His claims that these are batteries taken from recycled or demo laptops somewhere in China, packaged up and sent to him in volume, are rather difficult to take at face value.
Even a brand new, unused lithium battery made 5-6 years ago by Apple (given that we are talking about machines Apple doesn't support anymore) would be pretty degraded already and not something you could put into a client's machine and warranty it as new. A battery from a store demo laptop or, even worse, recycled from an old laptop? Suuure and monkeys fly.
Whether these were originally made by Apple or not is really irrelevant at this point, because they have been either extensively modified (if nothing else then the insides were replaced) or most likely weren't even Apple made to begin with. So Apple understandably objects to have something like that imported (and sold to customers) with their logo on it. That's all.
He is playing ignorant and talks about that case with the repaired displays - but that's not at all the same thing. Those parts were provably Apple-made and only repaired. How do you repair a worn out lithium battery? Right, you can't unless you replace the guts.