Best USB battery pack

Giles

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Giles Elliott
What are the best USB battery packs to power an A9ii? I am more interested in powering than charging the battery but all suggestions gratefully received. Specs to look out for or specific models please. I believe there is still a gentle drain on the internal battery but if there is a USB spec that overcomes that then that would be good to know. Many thanks in advance. Giles
 
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