New battery not being recognised by MacBook Pro
Six months ago I spilled some water over my MacBook. I had just bought it a few weeks before from someone else. I would guess 1/5 of a full glass of water fell, especially over the trackpad. I immediately turned it off and searched for instructions. I opened the back and laid my MacBook upside down on an oven grid and put a fan beneath it. That evening I took everything a part, piece by piece, following the instructions on this website. I found a little bit of water on the battery, and some against the sides, but that was only a very tiny amount. I couldn't find anything else. I left it open for a while and then put everything back together. Not sure how many hours that was.
After that it worked just fine. About two weeks after that I decided to align the trackpad better. I took the battery out, aligned the trackpad, put the battery in and that was it. My MacBook didn't recognise it. I thought the battery died, so I continued using it while connected to the MagSafe.
Today I received my new battery, a Hesker premium, which was the best I could find. But unfortunately my MacBook does not recognise that one either.
I followed some troubleshooting I found here, which consisted of taking everything out including the battery and charger. Pressing the power on button for 10 seconds, then putting the charger back in, Then pressing command+option+p+r, etc, something like that. That didn't help either, unfortunately.
The light indicator on the left does not work, even when the battery is disconnected.
I understand there are a few possibilities to what may be going on. Are there some I could test at home?
Thanks in advance.