how many volts charging digital mobile power for iphone mobile power bank devices

Mobile power is not red all electronic products? Principle, from mobile power, mobile power to all digital electronic devices for charging, the most mobile power for iphone important determinants, in fact, is that the PCBA board. Why do I say this? Until now, there are two mobile power bank main mobile power factors for the electronic devices require electricity. The first voltage: mobile power lithium batteries, nominal voltage is 3.7V, the highest 4.2V, then how many volts charging digital mobile power for iphone mobile power bank devices, PCBA board boost can be done, mobile power network mobile power once heard a message, going directly to 110V As for the specific technology is how to do, the author is not a professional staff, just to hear such a message, so in this description. Second current: different digital electronic devices on the current also have different requirements, such as the iPad requirement is 2.1A, and other common digital electronic equipment need only 1A, 1.5A is sufficient. The current strength of the author and not too much go into technical, so here mobile power bank mobile power for iphone say no more, just to understand that such an mobile power information line. Mobile power consumers at the time of purchase, please pay attention to this point, to see whether the mobile power can charge for electronic digital devices. '