How to improve the charging speed of large capacity power bank?

　　A lot of power bank supply 20000mAh claimed to be able to charge iphone 10 times, although a bit exaggerated, but also shows the power of this section of the mobile power really powerful.

　　For frequent train travel friends, to prepare a 20000mAh power bank supply is still very necessary, Who does not train the Ministry of Railways to install the power plug it?

　　On the road, a large capacity mobile power can effectively help us overcome loneliness, boredom and a long car back pain, but to the high-capacity mobile power is a very troublesome thing, because it is generally a twenty Hour. Now support your two strokes.

　　Method 1: High input voltage + high voltage fast charging plug. In general, the power bank input voltage is 5V, to improve the charging efficiency, increase the input voltage is a method. If you increase the voltage to 9V, then the charging time is shortened by nearly half. Provided that you have 9V fast-charge plug (or voltage converter), and your mobile power supply can accept 9V input voltage. Of course, these two conditions will consume your budget.

　　Method 2: Double-head charging. Some large-capacity power bank supply supports two interfaces at the same time charge, which is like two mobile power supply at the same time, saving half the time. Of course, to support dual-headed power bank supply is often the price is relatively high.