Looks like a dead battery, it has very likely completely drained over time and thus can no longer hold any charge. Time for a new battery.
+
Looks like a dead battery, it has very likely completely drained over time and thus can no longer hold any charge. Time for a new battery [https://www.ifixit.com/Guide/MacBook+Pro+13-Inch+Retina+Display+Mid+2014+Battery+Replacement/27832]