It seems to work. I bought this to slip into the phone holder I use in my car so I don't have to constantly unplug/plug in my phone when I need to use it. It kinda charges, really just maintains the current battery percentage, even when the phone isn't being used it doesn't really charge or maybe very slowly. What I don't like is that my phone gets very hot which makes my iPhone X suffer from performance issues in high temperatures. I'm afraid it could cause long-term damage so I'm not sure I'll keep using it and it's too late to go back now.
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