How to find out MBA-2011 13" battery serial number on the battery? I'm aware of ability to find out the battery serial number via About This Mac.

Is it also written somewhere on a physical battery, to be read without turning Mac on? If so, where?

Of course I'm ready to open the bottom cover of the computer to physically see the battery (and most likely to detach the battery from the Air to see the number on it).

I have Macbook Air 2011 13".
To get access to the serial # on the battery you would have to take the MBA apart?

If you want to do that here are the instructions.

It is easier to use the About This Mac.