66w Fast charge means that the mobile phone supports 66w high-power super fast charge.
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Mobile phone chargers can be roughly divided into travel chargers, seat chargers and maintenance chargers, and the average user is mainly exposed to the first two. The biggest seller on the market is the travel charger.
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A good quality charger can identify lithium batteries and nickel-metal hydride batteries, and then determine the charging mode. There is an integrated circuit on the protection circuit board of the lithium battery to store the characteristics of the lithium battery, which on the one hand allows the charger to identify the lithium battery to determine the \"constant current\" and \"constant voltage\" charging mode; On the other hand, it also allows the phone to recognize the lithium battery to determine the discharge mode.