Interesting! Also the music, of course, although I wish they would have shown the sequencer more. Anyway, always nice to see experienced artists expressing their music with these instruments.
And before anyone asks 
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You can find similar battery packs / chargers quite easily. They all tend to be in the 5000 - 5400 mAh range. You can search amazon for example, with terms like: 5200 mAh portable usb-c
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