Now available in a wide variety of mobile power, mobile power in the selection of our time, in addition to comparing its appearance and portability, but often also by comparing the mobile power parameters. So, mobile power noteworthy main performance parameters, what does? In this small series made a summarized:

Capacity (mAh): rechargeable battery is mAh (mAh), is the product of current intensity and time, when the current intensity with a milliamp (mA) for the unit, the time in hours (h) to do unit, both of them Multiply that mAh (mAh). Which represents the discharge current in a full discharge time, for example, means 1000 mAh 1000 mAh The battery current may be discharged for 1 hour.

Mobile power capacity into not too strict distinction, the general mobile power capacity 1000mAh-12000mAh about considering mainstream smart phone 2000mAh battery capacity is generally about (such as millet M2 battery capacity of mAh, the battery capacity of the Samsung i9300 2100mAh), so we will move into 2000mAh power capacity by the following (one-time charge, considering the portability) ,2000-5000mAh (give phone charging 1-2 times), 5000mAh-10000mAh (give phone recharged many times, or to charge your tablet) and 10000mAh above (to charge multiple devices) four grades, and will be in the subsequent evaluation of these four grades of different models of mobile power for evaluation.

We also pointed out that for mobile power, the greater the capacity is not better, after all, the capacity can be measured using the time only one parameter. At the time of purchase, should be based on their actual usage habits and needs to choose, should not blind pursuit of "high capacity."

Also worth noting is that the mobile power capacity under normal circumstances is the manufacturer of the marked on the product packaging capacity value, this value is generally specific to mobile power capacity internal batteries capacity value, rather than many consumers think actual capacity value can be used.

Output Voltage (V): Imitation computer USB port and cell phone chargers, usually 5V;

Output Current (mA): Currently the more common output current standards 500mA, 1000mA (1A) and 2100mA (2.1A) and so on. The former two are generally used to charge the phone, which is common in larger capacity mobile power to charge your tablet. And capacity, the output current is also selected mobile power needs to be considered an important indicator. This is because, in the case of the same voltage, the nominal parameters of the device to be charged is more similar to the current of the charging process to allow more efficient. Output current of the equipment on the different charging efficiency, love machine will engage in subsequent tests to verify.

Input Voltage (V): Imitation computer USB port and cell phone chargers, usually 5V;

Input Current (mA): similar mobile power supply output current to directly affect the charging efficiency of digital products, mobile power input current will also directly affect the charging efficiency of the mobile power. For example, a 12000mAh mobile power, if the rated input current of only 500mA, which means that the time required for full mobile power up more than 20 hours; But if the rated input current of 2.1A, then only about seven hours or so, is the sleep time at night can be filled.

Conversion Rate (%): In layman's terms, mobile power mobile power conversion rate is the internal batteries for charging and discharging the conversion efficiency. For example, in theory, a 5000mAh mobile power, if the cross-flow 5V/1A power charging, then five hours can be filled, but in fact it is not. This is because both the internal telecommunications and mobile power protection board, power supply interface, the charging and discharging process will have some wear and tear, including:

Circuit switching losses;

Run their own loss;

Boost loss; like.

Which we feel is caused by loss of boost, "Why do not we move the power capacity of the imagination so big" reasons. Mobile power lithium batteries used in discharge voltage typically 3.7V-4.2V, while mobile phones and other digital products, standard input voltage of 5V, so mobile power needs through internal booster circuit, the output voltage of 5V to charge the phone , which were also a loss.

In simple terms, the so-called "capacity" only on behalf of the mobile power specified at nominal voltage output and current discharge capacity, but does not really represent the true energy of mobile power. When the battery's energy in watts (Wh) as a unit, as capacity (mAh) and the rated voltage (V) of the product, such as a 5000mAh mobile power, where the capacity of lithium batteries capacity, rated voltage of 3.7V, Therefore, the energy should be 5000mAh * 3.7V/1000 = 18.5Wh, but if after the boosted output to 5V, the output power is effectively 18.5Wh/5V * 1000 = 3700mAh, this is what we may be found in the use, a nominal 5000mAh mobile power, it may not give a 1440mAh for iPhone 5 full three times electrical reasons.

The conversion efficiency of the batteries directly determines the quality of mobile power. Generally, imported batteries discharge conversion rate is 85%, the domestic A product is about 75% -85%.

These are just to help users choose to move some of the key performance parameters of the power, but the mobile power markets varies greatly, virtual standard capacity, parameters such phenomena are endless, not only pay attention when buying parameters, reference should pay more attention to others experience.

As people's living standards continue to improve, carry-in, more and more electronic products, such as notebook computers, tablet computers, mobile phones, digital cameras, portable DVD, PDA, MP3, MP4, GPS, and even warm equipment, medical care devices, to be used in batteries, but they often do not meet wife battery prolonged use of the device. And you can not put each device is equipped with a backup battery, not only costly and inconvenient. In order to solve this annoyance, mobile power emerged. With mobile batteries, the basic knowledge of how to care for it should be mastered. 

The first move is to reduce the power of the mechanical vibration, drop shock, not squeezed. Electrical products has always been not withstand the kind of throw touch, mobile power is no exception, a small mobile power batteries is actually a complex device, throw touch or squeeze at any time may break inside the components, especially some people like to readily Power on the move under the seat or on the nightstand, pressing books by various magazines, it is easy to damage the mobile power batteries. 

Ambient temperature is relatively stable, avoid high temperature, away from heat, it can not be stored in low temperature environments; avoid contact with metal materials, the occurrence of unwanted short circuit; Do not use harsh chemicals, cleaning solvents, or strong detergents to clean the mobile power . Clear mobile power exterior stains cotton stick small amount of anhydrous alcohol scrub. 

Do not try to use fully charged, which is like the cell phone battery maintenance methods is the same reason. Mobile power charger for mobile phone battery life first, before you move to full battery power supply itself, in the process, try to avoid the charge has not been completed is interrupted, as this also sacrificed its life. 

Mobile power should always be used. Every once in a while for the mobile power to complete a full charge and discharge. Preferably once a month. The first time, because the power is sufficient to move about 50% of electricity can be used directly, for everyday use to avoid full release. Often use your mobile power, mobile power can maximize the life. If the long-term without mobile power, the best live storage, keep 50% charge state store best. Full power storage will reduce the service life, store the battery is not charged over discharge occurs, all of the mobile power disadvantage.

Whether phone or other electrical battery, battery maintenance are the same. Maintenance of nickel-metal hydride battery, lead-acid and lithium ion, etc., but regardless of mobile and fixed, nor sub-brands or manufacturers.
The loss of speed and battery life depends on many factors, the quality and capacity of the battery is very important, as well as the intensity and frequency of use, maintenance if properly will affect battery life.

1 to avoid wrestling touch, especially careful not to squeeze. Electrical products has always been not withstand the kind of throw touch, mobile power is no exception, a small mobile power batteries is actually a complex device, throw touch or squeeze at any time may break inside the components, especially some people like to readily Power on the move under the seat or on the nightstand, pressing books by various magazines, please note that this is very easy to damage the mobile power batteries.

2 Note that the temperature and humidity. Surely we have had this experience, if the weather is wet, especially back to the south, home to the TV one open, the screen is a little blurry, colors will be distorted, and this is the impact of humidity for appliances. Of course, mobile power is no exception, so try to avoid extremes of temperature and humidity are too mobile power storage environment, if there is more humid weather situation, you can use it more frequently, in order to charge it, so it is a good protection Methods.

3 Do not try to use fully charged. This is like the cell phone battery maintenance methods, cell phone batteries generally do not advocate the case did not finish the charging is interrupted use of mobile power is also true. Mobile power charger for mobile phone battery life first, before you move to full battery power supply itself, in the process, try to avoid the charge has not been completed is interrupted, as this also sacrificed its life.

You can follow a few principles to use:
(1) do not fully charged Charging time (this is not very important, because a regular charger or charging on the computer is intelligent, full of the stop), especially the use of so-called universal charger or inferior charger .

(2) charging the battery, try to use a dedicated outlet, do not share the charger socket and the TV and other appliances, especially small-capacity outlet and this is not very important, because now the charger voltage fluctuation and less able to tolerate voltage charging.

(3) Do not expose the battery to heat or cold.

(4) Do not over-depletion of the battery, charging timely reminder charge, do not listen to the so-called special to completely discharge, then it will cause some irreversible loss, I have the painful lesson!

(5) make use of AC power. But not long-term without the battery.

The following precautions are just for reference, if you need to understand the specific use of mobile power and precautions, you would better see the relevant instructions and there will be a more detailed description above.

The precautions are as follows:
1, Do not drop, knock, or shake the Iphone External Battery
2, do not place the mobile power into the water 
3, we should avoid exposing it under the sunlight or rain for a long time
4, do not store or carry flammable liquids, gases or explosives in the vicinity of mobile power.
5, only the "CBA" original mobile power charger can be used. The use of other electrical will easily damage the mobile power, or cause overload, and it may cause damage to your battery.
6, place the mobile power in a dry place when it is not used, and avoid being contact with metal materials for the occurrence of unwanted circuit.
7, do not place the power supply on the high or low temperature environment, which can lead to the automatic protection function and automatically interrupt the power supply.
8, the mobile power should be stored in the place out of the reach of children to avoid accidents,
9, Do not disassemble the damaged  portable external battery charger. If the battery liquid contact your skin, please wash it immediately and contact a doctor

Although the above description is not very detailed, the basic usage and precautions are provided, and we will find some more detailed mobile power usage and precautions for you latter in order to make everyone use the mobile power in a better and safe way. In addition, I hope you also provide some experience in the use of mobile power.

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1. Linear charging external battery charger: it adopts pure resistance current limiting or charge management chip to reduce voltage. It reduces input 5V voltage directly to voltage required by the battery, and limits current through audion amplifier or comparator amplifier inside the chip. It enjoys the advantages of short development period and quite high success rate.

Disadvantages

First, this line achieves purpose of voltage reduction and charging through the linear stable voltage constant current for the excess energy consumption. The temperature is very high and the charging current can not be large. That is because the larger the charging current is, the greater the energy consumption will be and the larger the heat radiating area will increase.

Second, the rechargeable battery of this line is easy to polarize. The larger the charge current is, the greater the polarization area will become, and the lower the capacity will be. After a long time, the battery will lack of capacity. The best way to reduce polarization is to charge after using up the battery power. Reducing the times of battery charging is to longer the battery life (polarization refers to that the oxides accumulation hampers electrons migration). Linear portable external battery charger normally has three processes: constant current, constant voltage, and trickle charging.

2. Pulse portable external battery charger: it uses CMOS electronic switch, reducing voltage and charging by constant current through controlling the switch, also called PWM control charger. During the control process, gets data from CPU port detection for calculation, feedback and adjustment of PWM width and frequency to complete the charging process. Its disadvantage is that this line technique is very complex. Pulse external charger typically has four processes: trickle charge constant current, express charge constant current, trickle charge with repairing.

Advantages

First, high efficiency

This line controls current by electronic switch, which is theoretically lossless, low temperature, and fast charging, because low temperature is easy to reach the fast charging purpose.

Second, long battery life 

To prevent causing polarization affecting life of the battery during the charging process, it use pulse-type charging with rest repair process, getting better throughout the charging process of the battery power absorption.

www.external-battery.net, established in 2005, is the subsidiary company of Global Vision Group (HK) limited. We are a professional and famous wholesale power bank manufacturer and exporter in China. With our own professional R&D center, factory and marketing team, we devoted ourselves to offering customer with innovative 3C products.

This article comes from:http://www.external-battery.net/news/56.htm

As people's living standards continue to improve, variety, versatile types of digital devices into the household, people are enjoying the convenience brought by scientific and technological progress, it is also for the digital device itself endurance worry about the problem of inadequate . In order to solve the digital device comes with less power problems, designed for mobile phones, tablet computers and other equipment designed for charging mobile power products have emerged.

Mobile power brand on the market dazzling, people buy mobile power when the product packaging or by viewing the instructions on the product parameters to determine the product quality is better, usually product volume, batteries, capacity, voltage and current, conversion rate and other data are all part of the inspection, but little difference in these fits many tricky hidden data, from which the average consumer is difficult to find the problem, and today we'll introduce some information about the basic knowledge of mobile power .

Mobile power appearance and weight are the primary consideration when many users choose one of the factors. Pretty stylish appearance not only enjoyable, but also for everyday use to add a lot of color. Compact body is relatively light weight, portability has been improved, users in their daily activities can be very convenient to carry, to increase usability.

Currently on the market mainstream mobile power products shell material, there are two, namely, plastic or other fireproof materials ABS + PC plastic material, aluminum or aluminum alloy metal material. Plastic shell usually through piano paint treatment process to increase the aesthetics and comfort, relatively light weight; metallic casing will generally be brushed or matte process, increasing the metal texture, but also enhance the beauty and feel of the fuselage, relative weight will be slightly heavy.

In general, the volume of mobile power body weight with batteries capacity is directly proportional to the volume the greater the greater capacity of the volume is also heavier, more light and vice versa. Public about the user selects capacity batteries 5000mAh mobile power can basically guaranteed to charge the phone battery life, and the smaller, more portable to carry it; 10000mAh more mobile power capacity batteries on the size and weight is relatively large, and users in the can be carried out on the package, suitable for Tablet PC users are used; notebook computer users generally have choice about 20000mAh mobile power to ensure that the device provides a more lasting power support, of course, these are just a reference proposal, in actual use , users of the device, charging times and using different methods, we still have to combine their actual situation to choose mobile power capacity.

With a variety of smart phones, tablet popularity, more and more people are discovering all kinds of digital products, especially mobile phones have been unable to meet their own electricity use for our daily life needs, and can say that the emergence of mobile power to a certain extent to solve this problem. So for those who do not come into contact with consumers, mobile power, an array of mobile power how to choose it?
The power, the key will have to see batteries. Mobile power internal batteries is like a car's fuel tank and transmission, is responsible for the entire endless power mobile power, mobile power directly determine good or bad. Mobile power board can be seen as the control system is mainly responsible for the distribution of power and the conversion, the lithium batteries are provided 3.7V (or higher) voltage is converted into a standard 5V (or higher) voltage to was to provide electricity for the charging equipment.
The current mobile power batteries generally use lithium-ion batteries, but the performance varies, but is from the shape does not look like, and generally can not be reflected in the specification label. Here we start from the batteries, step by step to explore the mysterious world of mobile power.

Lithium-ion battery electrolyte according to the different materials used, can be divided into liquid lithium-ion battery (LIB) and lithium-ion polymer battery (LIP) into two categories. Both positive and negative materials used are the same, including lithium cobalt oxide cathode material, nickel-cobalt-manganese and lithium iron phosphate materials are three extremely negative graphite, battery works are basically the same.
The main difference lies in the type of electrolyte, wherein the liquid lithium-ion battery using a liquid electrolyte, lithium ion polymer batteries places instead of the solid polymer electrolyte. Such polymers may be "dry state", it can be "colloidal", and now most use of polymer gel electrolyte.

Lithium cobalt oxide is known to everyone in liquid lithium-ion battery, a common morphology 18650 and squares shapes. 18650 is the diameter 18 mm, height 65 mm cylindrical battery (looks like a larger version of the 5th battery), widely used in laptop batteries. As with the universal laptop battery, now available in more than 60% of the mobile power is also used in 18650.
Current commercial lithium ion batteries are basically optional layered structure lithium cobalt oxide as the positive electrode material, the theoretical capacity of 274mAh / g, the actual capacity of 140mAh / g or so, there are also reports the actual capacity has reached 155mAh / g.
The higher operating voltage cathode material (average working voltage of 3.7V), charge and discharge voltage stable, small size, high specific energy, cycling performance, high conductivity, the production process is simple, easy to manufacture.
Main advantages: mature technology, wide range of applications, compact size.
The main disadvantage: about 300 times cycle life, low security, anti-overcharge poor, not suitable for high-rate charge and discharge, pollution of the environment after disposal.
Two, nickel, cobalt and manganese (LiNiCoMnO2)

Nickel, cobalt and manganese, also known as ternary material (LiNiCoMnO2), is a polymer lithium ion battery, a common form of soft pack box shape. Notice can also be made of lithium cobalt box shape, but after forming a hard, Yong Shounie click to distinguish them.
Ternary materials with the popularity of smart phones to the rapid development in recent years, the use of more and more areas. It nickel salt, cobalt salt, manganese salt as raw materials, nickel-cobalt-manganese ratio can be adjusted according to actual needs.
Ternary materials made with respect to the positive battery safety lithium cobalt oxide, lithium cobalt oxide higher than life, reaching 500 times using life cycle.
Key Benefits: Volume diversity, the use of a very wide range, not an explosion, high safety factor.
The main disadvantage: higher prices, after disposal pollutes the environment, high-current charge and discharge performance is weak.
Three, lithium iron phosphate (LiFePO4)

Generic ferroelectric lithium iron phosphate, with the previous two batteries biggest difference is added to the iron battery positive. Lithium iron recent years has just started, is a promising material, its safety performance and cycle life are unmatched by other materials, these battery power is also the most important technical indicators. Charge-discharge cycle life up to 2000 times, single battery charging voltage 30V no burning, no explosion puncture.
Lithium iron phosphate cathode material to make more large-capacity battery pack used in tandem to meet the electric car needs frequent charging and discharging, and has a non-toxic, non-polluting, good safety performance, wide range of sources of raw materials, cheap, long life and other advantages, is ideal for a new generation of lithium-ion battery cathode material.
Currently ferroelectric with large capacity electric bus, signal the base station based energy storage and large UPS applications, including mobile power, AA batteries just beginning to test the water mass production, which makes the ferroelectric phase in large-capacity UPS, compact storage batteries , lawn, electric tools are widely used.

Today, the market for mobile power brand are numerous, for ordinary consumers, not afford to purchase its technical evaluation or screening, only by virtue of what they saw and heard the knowledge to pick, then in the end how buy it? This reporter interviewed the electronic market sales staff.

First, do not buy special low price mobile power. In the purchase, "penny stock" This sentence must be placed on the heart. Of course, do not rule out the market there will be some high-quality products, or businesses for a better quality of products for promotion, but these are one example. Simply from the cost calculation, you can easily filter out some serious vacuity electricity inferior products. The current use of more mobile power 18650, for example, the capacity of single batteries in about 2500 mA or so, the price of 10-30 yuan range, plus housing, packaging costs and a reasonable profit businesses, the a nominal 10,000 mA mobile power price should be at least 100 to 200 yuan between. If it is some brand-name products, with R & D costs and brand value, the price is a little higher. This calculation, online sales of those so-called "monthly sales ten thousand", "30000 mA is also only 90 yuan shipping" propaganda to go too.

Secondly, try to choose big brand products. Mobile power supply in the final analysis, so the purchase can be first in line to look at the power of the enterprise information designed to do, these companies produce mobile power is trustworthy. In general, the production of mobile phone battery or batteries, lithium battery mobile power companies produce more trustworthy, and its product quality more secure. In contrast, those OEM, OEM manufacturers of products, as well as unlicensed product is not recommended for consumers.

Accustomed to looking online for mobile power evaluation, are needed specialized equipment to test out the products on Taobao, almost exclusively show appearance, something rarely mentioned on the inside, up to mention batteries, on the purchase of such something almost no help. The vast majority of Taobao sellers are not professional, many professional things they themselves are confused, so my brother from their own professional perspective to give us some information, hope that helps.
 
Decided to move the power of good and bad two major components: batteries and PCB board

Batteries: There are two kinds of 18650 and polymer, lithium cobalt oxide 18650 usually liquid lithium-ion polymer usually solid or colloidal nickel cobalt manganese ions. Click here for special instructions, 18650, is not so dangerous online said, this poor resistance to high temperature batteries in extreme high temperature circumstances will an explosion, and how to control the temperature, is that the PCB circuit design and the battery itself resistance heating, for a regular manufacturers of 18650 and a complete PCB circuit board, it is generally okay. Many laptops, rechargeable batteries, digital camera batteries are used in 18650, if it will explode at any time, it is not should all throw?

Common 18650 and polymer batteries, PCB board: with lots of small parts supply / charging chip, boost chip protection circuits, capacitors, etc. These small parts for battery conversion rate and discharge stability plays a key role in the quality of these functions need to use specialized equipment to test it out, we can see that the circuit is clean, the layout is reasonable, there are good and bad capacitor, the capacitance of the most widely used at present, there are three: electrolytic capacitors, tantalum capacitors , ceramic capacitors, in ascending order of quality, are currently used in most mobile power supply electrolytic capacitors, this capacitor in extreme environments easy to aging, breakdown, leakage, tantalum and ceramic capacitors this problem does not exist. Capacitors on the PCB's role is filtered to ensure stable output current, we can think of the current instability on the phone continue to charge what impact? Specific estimates can not tell, but the answer is definitely not good.
 
Suggestions:
1, try to choose the appearance of solid workmanship mobile power (personally think that if an explosion, or at least reduce the power point)
2, if you select 18650 mobile power, capacity options try not to over 12,000 mA, too, and in extreme cases, explosion up powerful, single cell made so as not to over 2800 mA, because the current domestic goods production process, more than this number of mAh battery in terms of anti-attenuation and dispersion to be worse.
3, try to choose a regular indicate the source of the 18650 and polymer mobile power, but at present there is little domestic battery manufacturers indicate the source, as long as the regular factory on the line, from the appearance, difficult to distinguish between polymer and 18,650, because many uses aggregation objects by multi-layered structure composed piece, but if the thin, must be polymers, too thick, although difficult to distinguish, but the price should be able to tell you some information.
4, do not be too superstitious sales on Taobao, Taobao sales of over a million are usually high-capacity, low cost, low selling price of mobile power, this part of the product by the majority of users blitz. We must remember that you pay for this sentence, it means that low-quality low-cost, domestic mobile power batteries are similar, and many manufacturers to reduce costs, the use of 18650 There are several extreme tactics:
1, the old batteries
2, poor quality batteries
3, PCB board materials and poor design is not complete and does not provide over-voltage, over-charge, over discharge, over current, short circuit protection, overheating and six basic protection functions
4, low capacity battery virtual standard capacity 18650 hundreds capacity to more than two thousand mA range, made 2000 mA or less is more stable, more than 2400 mA high price, if someone saw 2600 mA, the price is low, and that the basic part of this. .

1. Output voltage range of external battery. Although some devices have USB interfaces, they also need to be charged by your external battery. However, you should pay attention to the input voltage range of your devices. Output voltage range of universal mobile power is 5.3 to 0.5V. If the input voltage range your device requires is not within the output voltage of mobile power, then, it is recommended that you do not use the mobile power supply for your device, to ensure the life of your mobile external battery.

2. The USB interface must match the devices'. Because various USB have different data cables for devices, in order to properly use external battery for your device, please use the matching USB data interface.

3. The placing environment of external battery. Various electrical appliances need to be stored in a dry environment of small air humidity, and environments of high humidity are detrimental to the preservation of all kinds of electrical appliances. Therefore, for the life of your mobile power, please store them in a dry environment as possible.

4. Always use your mobile power. Charge and discharge your iPhone external battery once a month, and often use it. That may farthest extend the life of the external battery.

5, Drop resistance and shock absorption. Actually external battery is a fragile part, whose internal components cannot stand beating. In particular, prevent it from accidentally dropping. Do not throw, drop, knock or shake mobile power. Roughly treat mobile power can break the internal circuit boards.

6. Prevent cold and heat. Do not place the mobile charger on where there is under high temperature. High temperature can shorten the life of electronic devices, destroy mobile power, transform and meltdown some plastic parts. Do not put them in a cold place, either. When the external battery works in a cold environment, the internal temperature rises, moisture can form inside the mobile power and damage the circuit boards.

7. Prevent harsh chemicals. Do not use harsh chemicals, cleaning solvents, or strong detergents to clean the mobile charger. To clean mobile power skin stains, cotton with a small amount of anhydrous alcohol can be used.

www.external-battery.net is a professional and famous 20000mah external battery  manufacturer and exporter in China. With our own professional R&D center, factory and marketing team, we devoted ourselves to offering customer with innovative 3C products.

This article comes from:http://www.external-battery.net/news/55.htm