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Hi - Bought a battery from eBay, which is probably where my problem starts. Anyway, removal and replacement went mostly smooth. First time putting it back together I misaligned one of the display connectors and when rebooting the phone the apple logo was smeared across the screen. I quickly shut it down, found the issue and reassembled. First power up it showed the apple logo then shut off. Thinking the new battery wasn’t charged I plugged it in and it powered up and it worked just fine. I left it plugged in to fully charge. Unplugged and went about my day. Used it a few times and a few hours later I went to use it and it was powered off. Tried powering up and it showed the apple logo then shut off. Did the same thing a few times until I plugged it in and it powered up and stayed on. Basically now it won’t really stay running unless I have it plugged into some type of power. I can maybe use it for a minute or two but then it will just power off. Is this just dud battery?

It sounds like a bad battery. The flub with the display connector probably didn’t cause any lingering issues since your display worked fine after you reseated it. It’s easy to miss clipping those in properly if you’re not used to feeling it.