Hi, I have an origional 2008 MBA and the battery has deteriated thanks to being left on charge more now my iPad is used on the road. I was going to replace the battery myself as it seems to be around £50 for a battery to DIY vs. £99 for apple to undo a few screws for me. The question I have is can I replace the A1237 5400nmh battery with the 5600nmh version used in the A1304 late 2009 model or is the connector or something different? Or machine not recognise/ other error? Anyone got any ideas or experience please? All help welcome!