Purchased a MBA in December 2012. Today I've received the "Service Battery" notification which stunned me as I don't have many cycles on it and it's not even that old. The battery health has mostly been fluctuating between 80-84% these last few months (sometimes went to 79% but only temporarily), but today it randomly dropped into the mid to high 70s and hasn't gone back to 80 since then. From what I remember reading if your battery health goes below 80% before reaching 1000 cycles then there's something wrong with it? I don't think Apple replaces batteries for free, but should I take it in? I don't have Apple Care, but my CC company extended my warranty for an additional year so is there a chance they will reimburse me for a new battery if I file a claim? It's just so ridiculous to me that it did this so fast. I didn't leave my Mac plugged in ALL the time, I definitely had it on battery power at least once a week since I bought it. I know people who treated their batteries like crap and didn't experience this.