是说充电器额定电流是500mA，可能输出电流大于500mA
22.202 Battery chargers shall be constructed so that reverse charging is prevented,
regardless of the state of charge of the battery. This applies even if the battery is inserted
with the wrong polarity.
Compliance is checked by inspection and by measurement.
请教：这个测试怎么做？如果手头没有电池，有没有模拟的电路来实现？
就是做电池的反极性（正负极反过来接），没有电池没法做，无法模拟
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