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Mine is still in the box. I have wireless at home and work and the Pro Max rarely needs extra charging. It will be my travel charger to split time with phone and iPad.
 
I love it. Charges my phone very fast. I don't charge my phone over night so I let it get about 97% before I unplug it and go to sleep. When I wake up there is no drain.
 
Mines still in the box, I use a wireless charger it takes longer but its more convenient to be able to grab the phone when a call comes in.
 
Mine is still in the box. I’m using Anker 30w that I bought when I had the Xs.
 
I’ve used mine 3 times so far.

When I first received my 11 Pro Max, I was scheduled to travel later that day. I had about 4 hours to get the Pro Max set up as if it was the XS Max I had been using. The PM came with the battery at 65% which I wasn’t comfortable with, so I used the 18W charger while doing all of the updates, downloading apps, etc. Plus I wanted to gauge how quickly this charger would work in a pinch. I was at 100% when I left for the airport.

Second time, I didn’t set the phone properly on my wireless charger one night, so it never charged. I was at 48% and didn’t want to start my day that way. So I used the fast charger while I got ready for work. I left with around 85-90%.

Most recent time, flight delays coming home (eventually got cancelled) caused me to sit around the airport over 6 hours longer than expected. I used the charger while I ate dinner at the airport to top off.

I personally find it very handy and love that it is a compact, portable size not much bigger than the 5W charger that was useless to me. My other chargers are either multi-port or wireless meant mainly for desk/nightstand use.
 
Never used and still in box. I use the Samsung wireless charger.
I use the Samsung Fast Wireless charger most of the time and keep the 30W adapter I bought for those rare times when I need a quick top-up. With my light to moderate usage, the battery on the iPhone 11 Pro lasts me 3 days
 
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