My Mid 2010 MBP now says Service Battery. I have learned from this forum, that this happens when the battery dips under 80%. I've been getting around 4-5 hours battery life. There's nothing else wrong with it. Of course Apple Care expired in November 2013. (I know, they only cover batteries if they are deemed defective) So, realistically, how long do I have before I have to replace it? Where's the best place to buy a battery? Or should I bite the bullet and have Apple change it? Coconut Battery Monitor says 517 cycles and 77%. At this point, I've decided to go to the Apple Store. I will plead for mercy with the Genius Bar and see how that goes. Worst case scenario, I spend $129 I didn't want to spend. I can't really justify a replacement. Maybe I'll be lucky and the battery is deemed defective.