An emerging clash between electric vehicle quick-chargers is the auto industry's rerun of the VHS versus Betamax videotape battle. Both the Japanese-developed CHAdeMO standard and the Society of Automotive Engineers' International J1772 Combo standard are direct-current quick-charging systems designed to charge the battery of an electric vehicle to 80 percent in about 20 minutes. But, like the videotapes, these two systems are designed to be completely incompatible.