Skeptical ...

Being in charger failure, I took refuge on Amazon to find a new, official, and that is as functional as the one provided with the notebook itself. So I bought from Amazon directly from the seller (a little more expensive than other vendors), to be sure to be satisfied. After receiving it, I obviously compared the old charger and new, hitherto all goes well, the same indications appear, it is the same size, etc .. Only it load much more slowly. Indeed, it provides 20 to 25% charge in one hour. Which is very low for my taste, when I compare my old who charged all generally in 1h30. So that makes me skeptical about the product's origin. Is it a trivial copy ..? Or, am I just came across a faulty product by chance ..? So, I am disappointed by the product, but also by the non-serious Amazon. I let three stars because despite everything, it loads and it can still help, but good ..