Are These Good Batteries

You guys have helped me a lot before - so thanks again.

I'm upgrading for the wife - getting rid of a older 36v I've managed to keep running. I found a newer 48v RXV with 1 year old batteries - confirmed with receipt. But I never heard of them before (I"m in Hawaii, and a dealer replaced these)

They are "U.S. Battery." Anybody have an opinion on this brand? Here's a pic.

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