Chosen Solution

MacBook Pro 2010. I replaced the battery with the one I received from ifixit. The computer booted. Two weeks later, there’s no power. The battery indicator shows no lights. If I connect the power supply, it’s light remains green. With the power supply connected, the machine boots but if I disconnect it, it loses all power. Also, with the power connected, the battery indicator blinks all lights five times when the button is pressed. The battery indicator icon shows 100% charge but also says replace battery. I’m attaching a coconut battery screenshot. I performed an SMC reset. What should I do? Any chance to receive a replacement for the brand new battery I purchased from ifixit?

There is the possibility the the MagSafe charging port has lost functionality. Even though it is still able to power in the computer, there could be an issue with it, hence why the battery will not charge. It’s most likely caused by a false load coming from the MagSafe port. Hope this helps!

It seems as the chargers power is routing straight to the main power and you battery is failing you to some degree. What I recommend if you can, try and buy a new receiver for the battery and solder it on the mother board. If you cannot do that then buy a new motherboard and use your old battery.