The subject needs to confirm whether your smartphone matches Huawei P40 original charger and 5A data cable in terms of charging protocol and power gear (voltage\/current). If the three cannot match, there will be a \"wooden barrel effect\
Here are three points to pay attention to choosing fast charging accessories:
1, interface: charging head, charging cable socket should be matched with the mobile phone interface;
2, protocol: charging head, charging cable need to be compatible with the fast charge protocol type supported by the mobile phone. If there is a protocol incompatibility between the phone and the charging accessory, the fast charging function cannot be triggered.
3, power: charging head, charging line output power (current\/voltage) should be matched with the power range supported by the phone. If the protocol between the phone and the charging accessories is compatible, but the power gear does not match, the phone will automatically reduce to the low power gear to charge.
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