iPhone 18 Pro/Pro Max not negotiating 15W with Qi2 chargers

I’d wonder whether the charger and the iPhone 18 Pro Max aren’t playing well together around a 25 watt request, and it’s all then reverting to 7.5 watts.

The available options here include testing with a different Qi2.2 capable charger, checking with the Qi charger vendor, contacting Apple Support and asking officially (new phone, etc), and waiting to see if there’s an iOS update that addresses this.

Vikingraid wrote:

Does anyone seem to be having charging problems on the iPhone 18 Pro/Pro Max using Qi2 chargers specifically?

I’ve noticed some very slow charging with 1+ hour to get to 80% unlike my older 14 Pro Max (also on iOS 27.0.1).

I therefore took some readings from the USB pass through meter.

Qi2 = 8.4W (7.5W)

OG Apple certified MagSafe = 18-19W (15W)

Qi2.2 = 29W (25W)

It seems like the 18 Pro Max cannot negotiate a 15W profile with a Qi2 charger whereas it can in the OG Apple MagSafe?

I think the 18 Pro Max requires at least a 30W charger to do fast charging.

Also this may be helpful for the requirements for Fast Charging a variety of iPhone models.

Fast charge your iPhone - Apple Support

There are two types of cables: one designed solely for charging, and another that both charges and enables data transfer.

Search for accessories that have completed MFi certification. Once an accessory has completed MFi certification requirements and is reported to Apple as sold/distributed, it will be searchable in our public database of authorized Lightning, headset, charging, iAP-enabled, and Find My network-enabled accessories.

Learn how to identify counterfeit or uncertified Lightning-based accessories.

You may try this (The suggestion is intended as a guide to help you find the right options and should not be interpreted as an endorsement or promotion of any product. Please conduct your own research and make an informed purchasing decision.) --> https://amzn.in/d/06mPoWvc

Vikingraid wrote:

Does anyone seem to be having charging problems on the iPhone 18 Pro/Pro Max using Qi2 chargers specifically?

I’ve noticed some very slow charging with 1+ hour to get to 80% unlike my older 14 Pro Max (also on iOS 27.0.1).

I therefore took some readings from the USB pass through meter.

Qi2 = 8.4W (7.5W)

OG Apple certified MagSafe = 18-19W (15W)

Qi2.2 = 29W (25W)

It seems like the 18 Pro Max cannot negotiate a 15W profile with a Qi2 charger whereas it can in the OG Apple MagSafe?

Are you saying 18 Pro Max cannot negotiate a 15W charging means it wouldn't charge? I was using a 15W early MagSafe, so original MagSafe 15W with my 18 Pro Max, when I first got it and it charged fine. But it certainly won't charge at a fast speed in any way. I have now upgraded to a much better and new Qi 2.2 25W charging stand and as expected, it does charge at the fastest speed.

So I'm confused what you mean by "negotiate?" It would be completely normal that 15W won't provide fast charging at all, but 25W Qi 2.2 would as expected.

For reference, I bought the Belkin 25W Qi 2.2 3 in 1 charging stand, which comes with a 45W charging brick. It's not inexpensive at $130, but is simply an amazing charging stand.

I am not talking an about wired charging.

The power brick I’m using is a 100W PD brick which is a Belkin 108W multiport charger, and I’ve thrown an Apple 100W USB C charger for good measure.

I’ve seen wired charging pull close to ~50W.

For wireless charging, the vanilla Qi2 refuses to charge at 15W and instead falls back to 7.5W.

However, the OG MagSafe charger manages to charge it at 15W while my Qi2.2 seems to do 25W based on what it pulled from the wall adaptor.

Vikingraid wrote:

No, what I mean is that the Qi2 chargers all fall back on 7.5W charging while the OG MagSafe charger does 15W and Qi2.2 does 25W judging by the wattage it’s pulling from the adaptor.

OK. But I'm not fully understanding what you think is an issue here?

Ohh what I don’t understand is why out of all the phones, the 18 Pro Max is the only phone that can’t seem to charge at 15W using a Qi2 charger.

All of my Qi2 phone including my old 14 Pro Max does it without an issue without dropping back to 7.5W.

Vikingraid wrote:

Ohh what I don’t understand is why out of all the phones, the 18 Pro Max is the only phone that can’t seem to charge at 15W using a Qi2 charger.

All of my Qi2 phone including my old 14 Pro Max does it without an issue without dropping back to 7.5W.

OK. I guess I see. I couldn't tell what the W is my phone is actually charging at. I'm not even sure I honestly care as long as my phone charges. It gets put on the charger when I go to bed at night and I wake to a fully charged phone, good for a full days use. That's all I actually care about.

MrHoffman gave you good options to check.

No, what I mean is that the Qi2 chargers all fall back on 7.5W charging while the OG MagSafe charger does 15W and Qi2.2 does 25W judging by the wattage it’s pulling from the adaptor.