My MBA 11" Mid 2012 batter only lasted for less than 45 minutes. I was search for the original replacement from Apple store which cost like 200$ plus. After much much research, I decided to buy the original battery from iFixit at 100$ while a cheaper one on Amazon will only cost 49$. The reason I didn't buy the cheaper as I found they have fake reviews on Amazon
My 1st time ever to open the MBA. Everything went well in less than 5 minutes. Now my battery lasts 3 hours or more.
The key thing here was that we are about to pitch our www.triip.me to investors. The new battery saved our day as we can't find any power plug nearby.
It is easier that it said