How high of a wattage is safe for an iPhone X iOS 15 charger?

Because Apple sells more than just iPhone. They sell iPad and a range of computers too, all with different size batteries, which can use different chargers to get charged faster.

Yes, there's a limit to how fast an iPhone can be "fast" charged. Past that limit more powerful chargers will not make a difference.

Currently that limit is 20watts or so. Anything greater will still fast charge the iPhone, but it won't be any faster than the 20watt charger.

Because different devices require more or less power than others. Macs need more power than iPhones and iPads.

Charging a Mac with a 12, 18 or 20 watt iPhone / iPad charger would take exceedingly long. Not practical, and not very user friendly.

The different chargers are meant to provide an efficient charging experience for the devices that they are meant for directly, but can be used with others that require less power for compatibility and ease of use.

I’m sure they could make a 96 watt charger only for every device, but that would also mean a very expensive charger that smaller devices cannot fully utilize and would be mostly wasted.

If you only own an iPhone there’s no reason to make you buy a 96 watt charger that costs $80 when a 20 watt charger for $20 will work just fine.

If you own more than one device, then the largest charger can be used with all of them. Its called being practical.

@deggie: No worries. It happens to all of us at some point.

Deggie is mistaken, iPhone Xs does support fast charging: link-> Fast charge your iPhone - Apple Support

Also, you can use any wattage charger. The iPhone controls the charging and cannot be overcharged.

I'm not sure I understand what you're suggesting here. According to Apple, iPhone XS should be perfectly capable of charging up to 50% charge in 30 minutes using the charging brick the OP purchased.

Fast charge your iPhone - Apple Support

The OP is using an appropriate charger. It's USB C. Why do you say it shouldn't do what Apple suggests it should and the OP was expecting?

wunwspirit wrote:

Hi @Phil0124 ,

Thanks for this detailed explanation. It has really helped me wrap my head around my questions. It seems that, if the iPhone device regulates the charging efficiency and only charges itself as fast as it is able, then acquiring a higher wattage charger

is not going to charge the iPhone faster. I've got a couple Anker 20w chargers with the USB C to lightning cable. Those should

do me well in faster charging my iPhone Xs.

Dennis

Exactly correct. To be pedantic, if you can find a USB-PD (power delivery) designation marked on your Anker adaptors your confidence is increased. If they are not marked then just do it by practical experiment to see if they will fast charge your phone. The phone is smart and will ignore any incompatible power adaptors.

As Phil0124 says, the higher rated devices will work but no faster than one which is "just enough". The only reason to use a charger with more rating than required is because you already have one for some other device you own. I often do this when I'm away from home and I only want to carry one adaptor which can charge all my toys.

The iPhone XS does not support the new fast charging standard. Anker is referring to phones that do.

Sorry, I didn't think the XS supported the same standard. My bad.

No need to apologize. My fingers would be raw if I apologized every time I was wrong!