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I´m planning on buying Raspberry Pi 4 and i don't want to waste money on a charger if the one that I have for my phone technically works.

I can save a few bucks for buying the case alone. I don't use it because I don't want to lower the phone battery life so I use an original Samsung 2A charger.

I heard that not all chargers works well with RPI 4

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Any device that supplies 4 amps at 5 volts will work to power the Pi4B.

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