
ESR CryoBoost, several months later: iPhone 17 Pro retest and long-term impressions
ESR CryoBoost Foldable 3-in-1 Magnetic Charging Station
I said in my original CryoBoost post that I wanted to rerun the charging tests after upgrading my phone. I now use an iPhone 17 Pro, so I finally went back to the same charger and did that.
I have been using it daily since May and have taken it traveling too. This is a follow-up to those first impressions, with new charging results and a few things that have become clearer after several months of use.
Quick disclosure: ESR originally sent me this charger for testing. This is the same test unit from my original post, and the measurements and opinions below are my own.
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The iPhone 17 Pro results
The wireless tests were done with my Pitaka case on. That is how I normally use the phone, and it is the setup I wanted to test.
From 0 to 80%, I got:
- USB-C: 46 minutes
- CryoBoost, fan on: 55 minutes
- CryoBoost, fan off: 67 minutes
After 30 minutes, the phone was at 57% with the fan on versus 42% with it off. After an hour, it was at 83% versus 75%. So the fan-on advantage was 15 percentage points at 30 minutes and 8 percentage points at 60 minutes. Turning the fan on still made a clear difference to charging speed.
Wired charging was the fastest, but with the fan enabled, the wireless result was only nine minutes behind it.
Moving from the 12 Pro to the 17 Pro made a surprisingly large difference in my results, especially with the fan turned off. In the old test, fan-off charging took 120 minutes to reach 80%. With the 17 Pro, that came down to 67 minutes.
The fan-on result changed from 79 to 55 minutes, while wired charging went from 62 to 46 minutes. The gap between fan-on wireless and wired charging has narrowed from 17 minutes to nine. It is the same CryoBoost unit, but it gives me a much better set of charging results with my current phone.
Several months later
I do not fold and unfold it very often, and the hinges have not changed in my use. I have not noticed any visible wear either. The Apple Watch arm was looser than the main hinge in my first post, and that difference is still there.
The fan remains quiet. I was pleasantly surprised by that when I first tested it, and it still has not become an annoyance in everyday use.
The thing I would most like to change is still the AirPods charging area. I mentioned wanting magnetic positioning in the original post, and after longer use I miss it even more. If I do not place the case quite precisely, charging sometimes switches on and off and the AirPods case beeps. It is a small part of the charger, but it is a real everyday annoyance, and I would like placement to be more automatic.
The 17 Pro results have definitely changed my opinion positively. Fan-off charging is now much more usable, and fan-on wireless charging gets close enough to the cable that I am happy with the tradeoff.
For me, wireless convenience is worth those few extra minutes. USB-C still wins if all I care about is finishing as quickly as possible, but the nine-minute difference is small enough that I prefer the convenience of putting the phone on the stand in normal use.
I still want better AirPods positioning, but several months later, with the newer phone, I like the same CryoBoost charger more than I did after that first week.
If anyone has questions about the tests or everyday use, feel free to ask.