The smart ED4 is shipped from the factory with a 7.2 kW charger. In European left-hand driven countries it's limited to 4,6kW due to the unbalanced load. As a extra you can order a 22kW charger that's only available in Europe, in the US it is not possible to charge 22kW due to the lack of a three-phase power grid.
Upgrading a car with the 7,2kW-charger to the 22kW is not possible.
The 22kW charger is based on the chameleon charger by Renault, buthas been highly optimized so it's for example while charging with just 1-phase up to twice as efficient as in the Renault Zoe (R240 / R90). Due to the optimizations the 22kW-chamäleon charger, the smart is equipped with, is way more reliable than the Zoe.
Standard charger
Suppliers: Delta Electronics EMEA
Designation: EOC72
Input: 1-phase @ 32 A (100 V - 240 V)
Output: 260 - 420 V
Charger subject to surcharge
Original: Renault, but clearly optimized by smart
Designation: Chameleon charger
Input: 1-phase or 3-phase @ 32 A (100 V - 240 V)
Output: max. 410 VDC @ 80 A