The detailed introduction of External Battery

External Battery, also called mobile power, mobile battery, backup battery, The concept of “ External Battery “ is development with the popularity of digital products’ rapid growth, its definition is convenient and easy to carry large-capacity portable power supply.

Now, the digital products function is Increasingly diversified, and the use of them is more frequent, it has more and more closely associated with our daily life, the importance of How to increase the use time of the digital products, to play its most important function is even more urgent. ExternalBattery, is the best solution to solve this problem, Carry a mobile power can be achieved mobile charging to a variety of digital products in anywhere outdoor.

Working Principle

External battery is a portable device that a set of electrical storage, boost, charge management, Storage dielectric generally use lithium batteries, because of the relatively small volume of lithium batteries, large capacity, wide market liquidity, affordable, widely used in digital products. The voltage of lithium batteries is between 2.7V – 4.2V, the voltage decreased with the decline in electricity consumption, and Voltage of 2.7-4.2V can not directly charge the other digital products, Because digital products lithium voltage is also 2.7-4.2V, the voltage between the same potential can not be charged. So the output power of the mobile power must have a boost system, boost the 2.7 – 4.2V voltage to 5V, so that it can charge to other digital products, such as cell phone, MP4, tablet pc, psp and so on. Of course, the mobile power is not a one-time equipment, it can be used repeatedly hundreds of times over. So when the mobile power is used up, we must charge the external battery, The principle is the same with charge the cellphone, Connected to 5V USB computer interface or USB charger cancharge mobile power. So the external battery must also have a charge management system, the charge management system can automatically adjusts the charge current based on the voltage of the lithium batteries, the Process have pre-charge, constant voltage charging, and Float charging, etc..