High CPU consumption, 33% battery, suddenly MacBook Pro Retina shuts down saying it needs to be plugged in
I had the same issue; I did an SMC reset.

Connect the power adapter to the Mac. On the MacBook / Pro's keyboard, hold down the Shift Control Option keys and the Power button at the same time. Release all keys and the power button at the same time – the little light on the MagSafe adapter may change colors briefly to indicate the SMC has reset.