Essentially, should an EV driver in either market run out of juice, he or she can phone the towing company and someone will be dispatched to their location with one of SparkCharge's modular portable chargers.
Those portable chargers use battery modules packed with 18650 cylindrical lithium-ion battery cells - the same as Tesla has used on cars like the Model S and Model X since 2013 - each of which stores a total of 3.5 kWh of charge (3.2 kWh usable). They can be stacked, up to five modules on one charger, for more juice if needed; SparkCharge says that five modules together can carry enough energy to add up to 75 miles of driving range, which is more than enough to get an EV driver un-stranded.
For now, SparkCharge's portable chargers only offer a CHAdeMO plug, putting out 20 kW of DC power, but a CCS Combo plug option is on the way.
