I've got a phone charger that delivers 4.5 A at 5 V (Huawei SuperCharge), which should be enough to power the the Pi 4. Can I use this charger or do I have to buy the original one?
Thanks in advance
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Yes - it will work.
The only thing you should be aware of is the possibility that your Huawei charger uses an
e-Marked cable. The
e-Marked cable will be a problem IFF you have one of the "first-run" RPi 4s, this because the Raspberry Pi Organization built thousands of units with a design flaw. The design flaw has now been recognized & corrected, but again, there are thousands of faulty ones in circulation. Some details explaining why*
e-Marked cables won't work (& other details) are in this answer.
I don't personally have experience with the new Raspberry Pi but I have successfully powered all kind of Pis with all kind of power supplies and chargers. Occasionally some of the cheap chargers gave up and died but it did not happen very often.
Your phone charger is well above the recommended rating of 3A for Pi 4 so it should work without a problem.
If you want to be extra sure buy the original one.