This is an Apple original (OEM) battery.
The Mid 2009 Battery is also compatible with the Original/Late 2008 model. It has an estimated 5% higher capacity.
This product is currently very hard to find quality, OEM batteries for. We are not sure when we will have more. We do offer a replacement, 3rd party battery that is compatible. You can find that product here.
- MacBook Air 13" A1237 Original
- MacBook Air 13" A1304 Late 2008 to Mid 2009