The 3.4a dual port charger is good. The 3.4a current is large, the charging speed is faster, and the time is shorter to fully charge the mobile phone, and the usual fast charge is this parameter.
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As long as the charge and discharge will cause irreversible damage to the battery.
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Most fast-charging technologies are nothing more than that. High current or voltage; To achieve super fast charge, this is fundamental, so it is inevitable that high temperature, high pressure and other easy to damage the battery behavior. Various protocols are more to communicate charging components and limit voltage and current, and regulate according to temperature, so as to protect the battery.