@Przemek, your English is fine. 😊 But to throw another head scratcher into your explanation of the last two digits of the date code, where for yours is 47 for a manufacture code of China, I have two new batteries with one having 2019 17-49 and the other 2019 33-49. The first was manufactured in Korea but the second manufactured in Malaysia. So, the question becomes, what does the 49 represent?