These are designed and manufactured by ShtokCustomWorx with the idea of using it as a way to have a "power pack".
Meaning you can remove a battery and speaker module using these PCBS.
Then can handle 15 Amps continuous, 20 Amps burst.
Supports 4 connections Battery +, Battery -, speaker + and speaker -.
These do not come with the pins already soldered on. The pins will need to be soldered in place.