Here you will find the full information on charging your smart.
smart EQ fortwo cabrio: combined power consumption in kWh/100 km (NEDC): 17.5-17.8; CO2 emissions in g/km (combined): 0. 
Find out all you need to know about charging options here.
Charge in 40 minutes.
Charging for 40 minutes with the optional 22 kW charger will increase the charge level from 10% to 80%. All you need to know about charging times.
smart EQ fortwo: combined power consumption in kWh/100 km (NEDC): 16.1-17.6; CO2 emissions in g/km (combined): 0. 
Rapid charging cable.
Your smart is equipped as standard with a Mode 3 cable. This allows super-fast charging at your Wallbox or public charging stations. A Mode 2 cable for connection to any household socket is also available as an option.