Installed new battery. Not working right?!?!
I bought a battery from battery plus for my Macbook Pro 13" Early 2011. I installed it and it wouldn't turn on. So I figured it just wasn't charged, I plugged in the charger and it turned on. Great!! Not really. I noticed the battery symbol in the status bar has a "X" in it and when I unplug the charger the mac shuts off. Don't know why, so I'm here for help.
MacBook Pro, OS X Yosemite (10.10.2)