TPT How to turn a huge tower radio from 1995 to portable sound system I'm sorry if this question doesn't belong here, I really don't know where should I ask.

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So far, my biggest problem was charging this thing, as it has one cable for socket, I need to make a portable socket with huge power. I wanted to ask if it's okay to use 2 power banks (20,000 mAh each)  that will be connected to AC-DC convertor which could be used as one huge powerbank with socket.

Thanks