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BQ25672太阳能充电测试：在弱光照射情况下，首次接入太阳能板能充电，充电电流有50多mA, 将太阳能板遮住后，再重新暴露就不能充了，这可能是什么原因引起的?（如果是因为光太弱不能充电，为什么首次接入时又能充呢）
