Do not mix.
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Due to different chargers, there are differences in charging specifications and fast charging principle, mixed chargers not only can not achieve fast charging function, but also may appear slow charging and unable to charge.
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Generally speaking, you can also charge without using the standard charger and data cable, but in order to ensure the safety and quality of mobile phone charging, it is recommended that you use the standard charger and data cable.
You can't. Some cell phone batteries cannot withstand high voltage chargers. The battery will be damaged.