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Got the same deal in 2017 as well. it outlasted my other external battery, an Anker.
5k? This is 20
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I.e. how much of the power going into a decent wall adapter ends up my my phone's battery when the two are directly connecting using a decent USB cable, versus how much of the power going into the same wall adapter ends up my my phone's battery if the wall adapter is used to charge a decent power bank, which in turn charges my phone?
Mostly I'm just curious, but I'm also thinking of charging all my devices from power banks instead of from wall adapters (actually, in my case it's not a wall adapter but a solar panel with a USB output, and it's just a lot more convenient to charge power banks from it than devices).
Also, while we're at it, why so cheap for a 20Ah power bank?
And do any of these come with wireless charging, either to be charged or to charge other devices--or both?