清晨的白莲泾停车场,时针刚指向7时30分,上海世博越江线巴士司机徐卫琴就已忙开了:启动所有电源开关、打开全部舱盖、清点电池组、校对刹车线路、检测轮胎气压……动作很麻利,额头已渗出了汗水。7时50分,徐卫琴还不放心,又迅速复查了一遍。看到电池剩余容量显示为50%,她果断将车子驶进充电站更换电池。“50%的电池容量只能跑上40公里, Early morning Bailianjing parking lot, the hour just pointed to 7:30, Shanghai World Expo Yuejiang bus driver Xu Weiqin has been busy: start all the power switch, open all the hatch cover, inventory batteries, proofing brake lines, testing tire pressure ... ... action is very smooth, forehead has oozed sweat. 7:50, Xu Weiqin do not worry, but also quickly review it again. See the remaining battery capacity showed 50%, she decided to drive into the charging station to replace the battery. ”50% of the battery capacity can only run 40 kilometers,