The direct charge is fast charge, and the seat charge is slow charge.
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Both should be used, to use less direct charge, more charger.
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Direct charge (line charge) is a safe and reliable way to charge, with no adverse impact on battery life.
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Because the charge control circuit on the phone will ensure that the charge is not full; However, too long charging time may cause the phone to heat up, which may affect the life of the phone; Charging on the mobile phone, once the battery has a problem, such as the use of inferior batteries appear drum, explosion, leakage, explosion, will inevitably cause irreparable physical damage to the mobile phone.
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The charger is used to charge another battery during the use of the phone. The need to connect the original charger (line charge) is the safest and most reliable way, because the constant voltage and current of charging is completed by line charge, which can avoid the damage of the battery by too high voltage. At the same time, because the battery is separated from the phone for charging, any problem with the battery will not affect the phone.