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It is precisely because of the existence of the protocol, so that different fast charging protocols are not fully compatible, most mobile phones only use their own charging head, in order to achieve the fastest charging speed, this situation we call \"private protocol\".
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There are a variety of private protocols, the most well-known is OPPO's VOOC flash charge, in general, OPPO's VOOC flash charge can be compatible with OnePlus's WARP, realme's DART flash charge, and the chargers between them can be universal. vivo's FlashCharge speed is also quite good, but the compatibility is not as good as OPPO, and can only be used for their own machines.
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Huawei's Fast Charge Protocol is divided into FCP (Fast Charge Protocol) and SCP (Super Charge Protocol). The former was used more in the early days and belongs to the high voltage fast charge school. It is now mainly based on SCP, and currently supports up to 40W, and only supports their own machines.