I have had my macbook for about 2.5 years. The past few weeks i have noticed some type of battery issue. First I noticed that the led light on the charger was going back and forth between green and orange (charged and charging) (every 2-3 seconds). I also noticed that on my top right part of my screen where battery life is shown it keeps going back in forth between (calculating....) and (Charged symbol: time). Secondly, after about a week or so my battery started dying within 5-10 minutes after being unplugged. Third, now my fan seems like it is always on high. Is my battery just dead?