Yeah, it doesn’t seem like all phones shutdown due to battery issue, but it does seem like all 6/6s/7 phones on 11.2+ are throttled as the battery ages and discharges.
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iPhone 6 64 GB.
Problems could be due to parts from different suppliers. The phones have different components. I've always used AT&T GSM versions except for the unlocked 7 Plus I bought for the Qualcomm modem. I have a depleted battery on my old iPhone 6 128 GB but I used that phone heavily and then gave it to my mom. We have a large family and I suspect non-stop what's app notifications did lots of damage to the battery. She was getting about 2-3 notifications every couple of seconds from morning to night so the screen was almost always on. It also suffered a bad drop that separated the screen from the enclosure. No screen damage or scratches at all. I popped the screen back in and the phone continued to work fine.