If the pulse light blinks during charging, the battery pulse is being charged intermittently. Every 4 to 5 seconds to charge the battery, it will stop once, and then continue to charge for 4 to 5 seconds, so repeated, this charging method is pulse charging.
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The charger determines that the charge is close to full according to the detected voltage, and then uses the trickle charging method to continue charging the battery, at this time the charging current is quite small, and it is intermittent, such as charging 5 seconds to stop 5 seconds, in this way to make the battery fully full.
It may be caused by your poor contact, it is recommended that you check it before charging the phone