I don't get this. My mom's white MacBook (Intel IGP model) showed an X across the battery like it doesn't work, so I bought her a new battery for it. However, I installed the new battery and it still shows an X but it actually does work. I figured it out by accident. I thought maybe I bought a bad battery. I tripped over the magsafe and the MB stayed on... confused, I am now here. Not finding much about this. What causes OS X to display an X across the battery icon? Doesn't this usually mean the battery is ruined? When pushing the button on the bottom of the battery, it shows five LEDs as it's fully charged and working. I unplugged it several times, and the MB stays on. It also reduces the screen brightness and seems to go into battery power saving settings when unplugged. So how do I get OS X to see the battery? It must be charging properly as it's not hot or bulging or anything at all. The problem is simply that it's not showing the battery information at all as though there were no battery plugged into the MacBook. But it works as though it's plugged in and all is normal??? Confused. Thanks in advance for any assistance you can give.