Normal, because the charging treasure output current is greater than the charger output current, that is to say, the charging treasure is faster, the input mobile phone current is relatively large heat is normal, as long as it is not hot.
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Mobile power (charging treasure), is a set of power supply and charging functions in one of the portable charger, generally by lithium-ion batteries as a storage carrier, mainly for portable electronic products (such as mobile phones, laptops) charging mobile power, generally used in the absence of external power supply. The common mobile power supply is composed of battery (block), protection circuit board, shell packaging material, thermal components, PTC and other parts.
At present, the magnetic wireless charging function of the iPhone is joked about more, but it can not withstand heat. In the case of a slightly hot phone and charger, the output power of wireless charging tends to fall from the highest 15W to only about 5W.
In general, a larger coil leads to better heat dissipation efficiency and a more stable magnetic field. So some manufacturers are not less in this area, such as the green link launched this year magnetic wireless charger, is the use of a combined version of pure copper large coil, so as to bring stable magnetic field and better heat dissipation performance, to achieve charging speed and charging stability.
Apple's magnetic wireless charging equipment generally does not appear hot, if there is an obvious situation of hot may be short circuit or unstable line connection or virtual connection caused by the problem, need to be repaired and then charged.