Flash charge is actually fast charge, but the name is different. There are many common fast and full solutions, and the more representative ones are the flash charge used by OPPO and OnePlus, the QC fast charge of Qualcomm platform and the PE fast charge of Mediatek platform.
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VOOC flash charge is a low voltage high current fast charge, low temperature when charging, more safe.
QC3.0 is high, low current fast charging, charging temperature is slightly higher, but the wire requirements are low, more convenient