These 10 electric cars charge the slowest, according to the first head-to-head testing

Charging speed can vary with things like weather and input, so Emunds set out to provide one of the first true head-to-head studies on charging speed yet. Getty Images

• When it comes to charging, electric vehicles can vary widely in speed.
• Some can add hundreds of miles of range in an hour of charging.

Slow charging can turn a quick charging pitstop into an agonizing wait.

To make things worse, it's not always clear what models might juice up faster than others, thanks to vague claims from automakers about battery capabilities.

Charging speeds can be affected by factors like the outside temperature, battery temperature, how many people are at a charging station, and any software settings meant to protect the battery's long-term health.

Still, chemical and engineering differences from car to car and battery to battery can affect charging speed and are worth considering when deciding on a new set of wheels.

To account for these variables and give us a true head-to-head measure of charging speed, the experts at Edmunds used data from the firm P3 that monitored electricity use while an EV was connected to a level-3 fast charger. The dataset also included power-request communications between the vehicle and the charging station to track each battery's capacity.

Combined with Edmund's data on electricity-per-mile on different vehicles, the results give one of the first looks at charging speeds across automakers and models.

These are the 10 slowest-charging EVs of the 43 in Edmunds' test: