help !! battery macbookpro won't charge

Bought off of eBay for basic use, for an elderly relative. The item in question is an early-mid 2009 MacBook (the plastic one) and it has the T style charger. It will not go orange, despite how much I clean the charger and port. I have got it to go orange only once, which lasted around 10...

So the a1286 battery in my mbp15 8.2 went bad. I replaced the battery last night and connected the charger. The light on the charger stays green and doesn't turn orange to signal that it's charging the battery. I made sure to buy a genuine A1286 battery from a reputable dealer so I don't think...

History: I burned a chip on the Logic-board, whilst cleaning the fans, I didn't know what chip it was, but I closed it up, and remarkably, it restarted & and to my surprise, continued working, until I saw that the battery was not recharging whilst the machine was plugged in with it's adapter...