If the phone can be turned on normally, the red light flashing when charging means that the current power is low (generally less than 20% will remind), only need to keep the phone charging for a period of time, there will be a red light into a yellow light flashing, when the power reached more than 80%, the light turned green. This is a normal phenomenon,
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If the red light flashes when charging, the battery cannot be charged and the machine cannot be turned on, it may be the aging or failure of the battery, the fault of the internal circuit of the mobile phone, the fault of the mainboard chip and other parts, etc.