Why so many electric car chargers in America don't work

In a nondescript office park in San Jose, Calif., ChargePoint Holdings Inc. runs a torture lab of sorts. It’s here that the operator of the U.S.’s largest network of EV chargers subjects its products to extreme temperatures and rain, and puts them through simulated dust storms and earthquakes. Pulley systems tug on charging cords over and over, mimicking years of use, and a different device slams a steel ball against chargers to see if they’ll crack. Every year, the lab tests about 3,300 chargers, which then can’t be deployed in the wild.