Phone what protective sleeve? What kind of mobile phone sets look good?

Purchase of mobile power principles: high-capacity
         What is the purpose of the purchase of mobile power? Can provide longer battery life is to find a product. Of course, the greater the capacity, heavier weight, which is proportional to, because the battery itself is a virtue, so buy the high-capacity mobile power when you need to consider carefully.
Why is the capacity the better it? Judgment is based on actual output capacity of mobile power. Recognized by the mobile power conversion rate formula: (mobile power capacity * 3.7V * conversion percentage) / 5V, such as a 5000mAh capacity mobile power the calculated standard conversion rate of 85% 5000 * 3.7 * 0.85 / 5 = 3145mAh Apple mobile phone battery standard capacity is 1420mAh, can charge about 2 and a half times around. So the greater the capacity, the actual output of the greater capacity.
(Note: Why divided by 5, the output voltage is 5V, if your output voltage is 3.7V, then is divided by 3.7 in this segment, it raises an important concept: the conversion.)
         The conversion rate refers to the batteries output to mobile phones or digital devices, because the internal resistance caused some loss to be less than the marked capacity of the batteries, the output capacity of the Li / nominal capacity * = conversion rate in the middle. Nominal capacity, what is it? Generally refers to the nominal capacity of the batteries, the battery capacity is calculated based on the volume of the battery, L * W * D, then the capacity of the batteries can be estimated based on a coefficient value after fine processing, but this is not accurate, the battery can be increased to 200-300mAh.
Present, mobile power conversion rate is generally about 85% can be regarded as relatively good, high can reach between 90% -93%, relatively rare, there might be only official data, for reference only. The conversion rate is mainly influenced by the mobile power the PCBA protection board.
 
The second principle: buy mobile power mobile power brand
        Accurate, mobile power is not a real brand, mainly due to the short time truly popular mobile power generated too early to talk about the real brand, there are now many emerging mobile power brand quality are good, the next listed brands can market sales of reference is not to say that other brands is not good quality, but off.

The third principle of the purchase of mobile power: batteries brand.
        Mobile power batteries are generally divided into two types, one is 18650, the major manufacturers, Sanyo, Panasonic and Samsung mobile power a lot is to do 18650, 18650 battery is notebook that. In addition, the polymer lithium battery industry called soft pack. Polymer battery industry sector is relatively well-known, the ATL (Dongguan New Energy), BAK, B & K, the work of God, the work of God, BYD fact, polymer many, we can search, you can find a list of some of . Relatively fair to say that on a well-known manufacturers and two manufacturers, capacity, quality does not have a big gap, but there is a certain difference in the defect rate generated by the production process. The same ingredients may line manufacturers defect rate is 1%, may be the second-tier manufacturers will reach 5%, which is possible.
Distinguish between these two batteries? Actually very simple, and can be distinguished according to the appearance of mobile power, 18650 is cylindrical, and is a steel shell, so did not have to change a great thickness of the polymer is soft pack can be any shape, and can be very thin, we can use this rule to judge, flat type, personality, are generally lithium polymer batteries, bulky, thick basically 18650
18650 lithium polymer battery advantages and disadvantages?
18650 mature production of Arts, the capacity of the single largest possible 3400mAh generally 2000mAh, 2600mAh existence of security risks is likely to burst, notebook battery bombings, is a Ming patients, but to declare that the probability of this is very small, unless it is used some of the disassemble 18650 battery. Advantage of the soft package customize a variety of shapes, lithium polymer battery safety hazards, the leakage, short circuit expansion pack, the most serious situation is to produce combustion.
 
 
Need to pay attention
 
The first is the used batteries.
        Yesterday saw the news Sina reported brand using demolition electromechanical core ", and reported in Guangdong of Guiyu scouring second-hand electronic foreign garbage. The used batteries damage than xubiao much more serious. 18650 battery batteries products, due to the use of time beyond a certain period of time, not only the decline in product and performance, and there is a serious security risk, exploded one after another in the past 2006 notebook is Ming cases.
The new 18650 found safety problems, not to mention second-hand, disassemble, 18650. If used, disassemble 18650 into the mobile power market, the industry will be a devastating blow.
 
The second is: capacity xubiao.
        Due to the unspoken rules of the battery industry, this capacity vacuity is a common problem, now moving to the power core thing is the battery core, so this the ills also brought to the market of mobile power, before 315 Computer News reported the list The so-called Chinese mobile power brand vacuity.
While the most tangled capacity virtual standard is difficult to find a testing standards. Not to say that the capacity can not be detected, but detection is very inconvenient, requires a series of equipment and testing processes, and ordinary users is not possible to have this testing conditions to solve this problem, then, can only rely on businesses to self-discipline, seems to be a little difficult. At least, the current environment may not be able to do it. So who can provide these services in the face of consumer evaluation criteria?
No matter how kind, mobile power fiery like tea development, we hope that this emerging digital industry, must in the future our cell phones, big screen, smart, gaming applications are becoming more common, mobile power must equipment products.