There is a direct relationship between the power of the charger and the charging speed. The higher the power of the charger, the faster the charging speed can theoretically be provided, but this relationship is not linear and is also affected by other factors. Here are some key points:

Power definition: The power (P) of the charger is usually in watts (W), which is the product of voltage (V) and current (I), that is, P=V×IP=V×I.

Charge speed: Charge speed is usually measured as a percentage of the battery charged per unit time, or as the time it takes for the battery to be fully charged.

Battery charging principle: The charging process of the battery involves the conversion of electrical energy into chemical energy. In the constant current charging stage, the battery is charged with a constant current until the voltage reaches a certain value, and it enters the constant voltage charging stage, at which time the current gradually decreases until the battery is full.

The relationship between power and charging speed:

Constant current stage: In this stage, increasing the power of the charger (that is, increasing the current) can directly speed up the charging speed. Constant voltage stage: In this stage, even if the power of the charger is increased, the charging speed will not be significant, because the current will naturally decrease until the battery is full.

Battery and device limitations: Not all devices and batteries support high power charging. Some devices may have specific designs to limit the charging current to protect the battery from overheating or other damage.

Charger and device matching: In order to achieve fast charging, the charger and device need to support the corresponding fast charging technology (such as Qualcomm's Quick Charge, OPPO's VOOC flash charge, etc.), and the output specifications of the charger should match the charging needs of the device.

Thermal management: High power charging may generate more heat, and if the heat is not managed effectively, it may charge efficiently, causing damage to the battery.

Battery health: Charging at high power for a long time may affect the long-term health of the battery, as high temperatures and high currents may accelerate battery aging.