Battery for American Flyer Ewave Tour

Details? Case style and voltage?
its easier to get suggestions without EBR members having to search for the details.
 
The battery on the American Flyer E-Wave Tour is a 48 Volt, 12.8 Ahr battery. I was hoping that if someone has this E-bike and has replaced the battery that they might relay where they got if from.
 
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