Similar. The Anker ones have been reliable, but I also have some Ravpower powerbanks and they are good so I expect the chargers are OK.
I have a very useful little device for checking what is actually going on. Easy to see if a source will charge up your iPad for example.
www.ebay.co.uk/itm/223165493484
"UK USB Charger Tester Doctor Voltage Current Meter Mobile Battery Power Detector"
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