I’ve got a 40,000mah power bank from Cygnett that I’ve taken to Australia and back multiple times and have never had a problem. I think that’s rated for 145whrs.
I've got a couple of Xioami 20000 mAh ones which have been great. I also bought a smart 30000 mAh from Promate, which has multiple output voltages, which failed in less than a year.
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