Interesting. There may actually be a question hidden in there. A 2N3055 is an old school power transistor which could certainly be used to charge a battery. Some of the numbers given do kinda sorta belong. There's no schematic though, as mentioned. Do spammers post stuff like this?
My first thought was it is spam. If it is not spam I apologize to the poster. The website referenced is a Chinese site that links people who want electronic components to people to make or sell them. So yeah, I'm pretty sure it is spamwith the idea to get that company url indexed by a search engine robot.
Why don't we ask the OP to clarify the post. I suspected something when I saw this was only the OP's second post. Who wants to bet on the odds of getting a reply?
Bob
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I think John61CT nailed it. A legitimate question to the wrong forum. I made a car battery charger at least 20 years ago that uses a 2N3055 transistor to carry the load. As for the question asked. . . . byx21-40 doesn't look like a component part number.
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