I have a 15 inch slightly used mac book pro and I'm comfortable with it but it's still new to me. My question is about my charger. When I plug it in, the orange light comes on but it says it's not charging. See pic: As you can see, it's plugged in but says not charging. Then after a minute, it changes to this: 89% but 19 minutes battery life?? ................... However, if I unplug my charger, it changes to this: Now I have 2 hours and 25 minutes of battery life. I've unplugged the charger, shut down my computer, took out and reinserted the battery but nothing changed.