1, Use voltmeter and load it to test the battery capacityHow to judge electric vehicle battery capacity? Test battery capacity, voltage of only using a voltmeter or multi-meter block without load to check whether the battery capacity is enough, it is difficult to accurately Just measure the voltage, the current consumption is few, so will have big pressure drop inside the battery, so according to the voltage is not low, but with quite a load, such as open headlight (load current 10 ~ 15 a), the horn (load current 6 ~ 12 a), the battery will dim the lights, horn husky, which shows a lack of electricity.