MBP battery won't charge

I have a MacBook Pro Early 2011 model A1278 which wasn't turning on, then I bought a new battery and it ran just fine. But the charger isn't charging it up (the charger is also fine, I tested in another MBP). I tried to reset SMC, NVRAM and cleaned the charging port, but nothing happened.
Now the battery just died (0%) and I don't know what to do, since I can't charge it up. Is there anything I can do to make it work?

Thanks in advance,
Luiz

It appears that you didn't fix the original problem which was why your MBP wasn't turning on in the first place - your battery wasn't charging so you had a dead battery.

You have already verified that...

• the battery is good (it's new)
• the charger is good as it works on another Mac
• the logic board is good because when the battery has juice, it works.

Now, it seems that since the battery has gone to 0% and the charger is plugged in, your MBP is dead, correct?

That means you Mag Safe DC In board is most likely shot.

This is fairly simple to fix (I am assuming you changed your own battery). iFixit.com has an excellent tutorial on how to replace this component. The good news is that this component is fairly inexpensive ($11 on Amazon).