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True power output of Anker 26800 II & other powerbanks

As the battery in my acer swift 5 is slowly degrading, I'm starting to look for replacement solutions. And power banks are very an appealing solution since they are much cheaper and easier than a replacing battery. 

By far, my choices are either the Anker powercore 26800 II (https://www.amazon.de/Anker-PowerCore-Powerbank-Ladegerät-Delivery/dp/B07YJMXBHT) or one of the Ravpower ones (https://www.amazon.de/RAVPower-20100mAh-Powerbank-Delivery-Externer-Schwarz/dp/B07KS4PXVF/ref=sr_1_14?dchild=1&keywords=20v+powerbank&qid=1589441441&sr=8-14). Only problem is, the specs on these things are all over the place and most reviews don't cover the laptop charging aspect of these (20v output).

The anker claims to be 45w, but everywhere else I look it says 30w and only 25w (20V*1.25A) on the 20v output (what the laptop accepts). Can someone who owns the powerbank tell me which is the true?

Ravpower does have a 45w (20v*2.25A) output, but they are relatively new name to me, so I'm not sure if I can trust them. Maybe someone with more experience with them can help.

Thanks

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