Test/Review of Eachine PA40W 5 channel usb power supply/charger

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I bought a number of Vinsic 40W power USB adaptors (VSCW502)

They are good for charging mobiles, but I don’t think that they are good for powering a Raspberry Pi. While I have not done a proper test, it seems to me that the output current drops over time – leading to instability in the computer