Yes, I replaced the battery with each of my 6 spare batteries. I also replaced the motherboard, screen/frame, and lower board (contains MEID, mic, speakers, vibrate, and part of the WiFi antenna). Literally no part has been left unreplaced; I have a few spares that I bought for their screens and batteries.
With two of the motherboards, any lower board, any of the screens, and a few of the batteries, I can get it to show signs of life by plugging in power then removing the battery so it shows me the screen with a battery and a question mark.
With one of those two motherboards, a couple times I was able to get it to give me a boot security error; that is how it was when I bought it. Somebody hard bricked it.
It's a bummer to abandon the platform when I have so many spare batteries and screens but it's time to move on. At least with the S4 batteries and screens should be plentiful and cheap.
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