Phone only charges intermittently when turned off topic

So about a year ago my charge port started burning every time I plugged it in, and in the drawer it went. A couple of days ago I decided to crank open the back cover and just replace the charge port myself and voila, it works. I've gotten it to turn on and I let it charge for hours, but it gets to about 14 percent after an overnight charge. As well as that, when I turn on the phone nothing detects it, and it certainly doesn't charge. When it does charge (which is when it is turned off) It charges for about 5 seconds then stops and starts charging again. I've looked for answers and all I am finding is restarting the phone, sending it back, or some weird process in broken English I can't remotely understand. I'm not really afraid of losing data but I don't want to re-do s-off and recovery as I believe I had trouble in the past. Is factory reset my only option?