Charging efficiency of car batteries

CITROËN C-ZERO

From the information leaflet, to fill the 16 kWh battery of the Citroen C-zero, you need a lot more than 16 kWh of energy, depending on how fast you do it:

Connection	Duration [h]	Energy In [kWh]	Energy Stored [kWh]	Efficiency (stored/in)
230V, 10A	8	18.4	16	90%
230V, 16A	6	22.08	16	72.5%
400V, 125A	0.5	25	12.8 (16kWh*80%)	51.2%