OK, so I just got my canned air and sprayed it into the port and onto the adapter. My battery is at 86%, but the light on the adapter is still orange, though it shows green when I first plug it in. I thought it was supposed to go to green at 80%, though I may be wrong about that. I've watched for a few minutes, but the battery percentage hasn't changed. That was a good idea though. Even though the hardware test showed a good battery, I have my doubts. It could just be a problem with the adapter too. The Apple brand is $72.00 for the power adapter on Amazon. The other brands get some reviews that say those don't last. I will wait it out.
You might consider the possibility that bits of dust or debris are partially clogging the mating surfaces of the charger plug and MacBook port. I've experienced this with an iPhone, and the symptoms included some wonky behavior, i.e. charging sometimes happened, but sporadically. [/quote]
