Did all of this very recently. I just put
this Ansanor battery in a couple of 2011 MCAs and they run fine (about a month into it). Neat thing is that they get 5-8 hours since it's a higher amp than the original.
One thing to be careful is that many of these battery ratings are only 300-500 charges, not the 1,000 that the original Apple one did. I figure that it's okay due to it being cheaper and it is very easy to install a new one in a few years.
Also one of the batteries did not line up exactly with all of the holes. I had to leave one screw out, but it's in their solid with all of the rest.
And one was a bit more effort to lock the connector in place. It seemed too tight. I squeezed a small screwdriver into the connector and slightly twisted to loosen up the connector just enough. It then popped right into place.
So far I'm extremely pleased with them.
I did order another battery
from this place that showed them at 5200mA but the one I got was 4500 so I promptly sent it back.