Laptop technical problem. Beyond basics involving power and CPU possibly motherboard soldering.

OK I'll start off by saying the battery was not charging while plugged in. And on top of that there was a small spill a few months ago that ruined the keyboard circuits so I needed to replace the keyboard. First thing I did was purchased an OEM charger and plug it in to test if it was a faulty charger. Once that didn't charge it, I purchased a battery and replaced it, it still didn't charge. So I Also ordered a DC Jack, the connection that runs from where the adapter plugs in to the motherboard and replaced that when replacing the keyboard. Keyboard works fine now however I still can't get a charge. Upgraded from windows 8.1 to windows 10. No good. I'll be forcing the bios to update even though it's at 1% battery and not recommended but the way power supply works in my board I believe it should be fine. Will it? My only other thought is that somehow the charger that I tested was faulty as well. Or that I'll need to find something on the motherboard such as FL one that needs to be re-soldered. Any ideas? I am leaning more towards hardware because I recall it not charging sometimes and sometimes charging. Additionally high pressure on the W ASD section of the keys can result in a power interruption causing the laptop to shut down immediately. The last point is that the CPU quad core is running at 100% after reboot with no programs. However when I open a high resource program such as a video game it will give priority to that and it will run fine, not slow, but will still remain at 100%. Thanks for any input and suggestions this laptop is soon to be finding a new home in the trashcan. The model is dell Inspiron 11 3147. Cheers.