Yep, I have a couple of the 22,400 mAh versions of the EC Technologies USB3 one (like this tinyurl.com/yaq7x74t). (There are now more recent versions on Amazon, where mine were from, which look even better, with quick charging)
They are brilliant bits of kit but a bit too clumsy for the intended purpose.
Daughter also got me a cheap solar powerbank earlier this year with a nominal 10k mAh capacity, which may be correct but the solar has trouble charging it, even in the current heatwave!!
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