When you send your phone into Samsung, you don't send the battery.
I really like anker products. Have always had good luck with them and they have great customer service.
I've also had a few phones repaired under warranty by Samsung (using banker batteries), and they never ask about accessories.
If they wouldn't fix your phone because you used another branded accessory when the problem has nothing to do with that.... They'd have a PR
nightmare. Not gonna happen