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I have a question.. My phone has an 18W fast charger. When charging it with a 30W charger, does it charge at 18W or 30W? I heard that phones have become advanced and can get rid of excess watts and take the specified watts from the device (my phone is Xiaomi MI 9T)
The phone controls the incoming voltage/current by telling the charger what to supply. The charger rating is the max the charger can supply, not what the phone will pull all the time.
They don’t “get rid” excess energy. It’s not like they pull 30W and drop 12 if them in a resistor to dissipate. If your phone has a max of 18W, then that the max it can pull regardless of charger being used.
The charger that your phone comes with is not always an indication of how much the phone can take. My samsung charges much faster with a 65W laptop charger with no issues but the box only came with a 25W charger. My new X15 ultra came with a 95W charger and I use it to charge my samsung too but it gets quite hot.
Overheating is a problem specific to the battery.
Phone will simply draw its stipulated current.
Also Xiaomi turbo charging is somewhat proprietary, sometimes a faster 3rd party GAN charger might not necessarily charge the Xiaomi phone any faster.
I have a few fast Ugreen GAN chargers and they need a MiPPS “conversion” cable to turbo charge / hypercharge my Xiaomi 15U