Millet and other actual power less than the nominal Liucheng

Mobile phones, Walkman, Tablet PCs, Cameras ... We have more and more smart electronic devices with us, and as many devices' batteries can not be replaced, the mobile power becomes a must.

According to the data released by CCID Consulting, from 2011 to 2013, China Mobile Power Market grew at an average annual rate of 70%. As of now, its market size has exceeded 10 billion yuan. In contrast to this huge number, there is a chaos throughout the market: more than 5,000 companies are involved, but no brand with enough monopoly power is formed. Due to the lack of standards, cottages and counterfeits are almost labels attached to mobile power sources.

May 2014, China Chemical and Physical Power Industry Association "USB interface class mobile power" Association standard release. In June, Consumer Reports referenced the standard and tested eight major mobile hot-selling brands in the market, all of which were selected to be more than 10,000mAh.

The test results show that the measured capacitance of these mobile power generally only nominal capacity of 70%, and millet, Philips and CUBE three mobile power measured capacity of less than Liu Cheng.

The capacity to be "stolen"

In the major mobile power introduction page, high capacity is the biggest selling point, because the level of this indicator is directly related to consumers using mobile power to charge their own devices. To iPhone5s, for example, its own capacity of lithium battery 1560mAh, in theory, 10000mAh mobile power should be able to charge it fully 6 times.

However, most of the current mobile power labeled cell capacity, in this "Consumer Reports" selected 8 mobile power supply, only the Sony CP-F10L marked the actual capacity of 6700mAh. In most cases, consumers can not understand the actual power of mobile power what geometry, only through a variety of ways to "estimate" capacity.

A long-term lithium battery test engineer explained to reporters, the current use of mobile power batteries are divided into 18650 batteries and lithium polymer batteries two, for consumers, these two batteries in addition to the size , There is no obvious difference. "The cell is the core of the mobile power supply. After multiple losses of step-down, step-up and line impedance of the protection board, the capacity of the output finally can not reach the capacity indicated by the cell," he said.

According to our test results, 8 mobile power, Scud SPB-M100 measured capacity of 6977mAh, with the proportion of the nominal capacity of nearly 70%, compared with CUBE E10A mobile power measured capacity of only 4842mAh . Scud and CUBE's actual capacitance difference of 2135mAh, which is sufficient to fill a HTCOne phone, so it seems that the gap between different brands of mobile power is not small. (As shown below)

Kwan Sek-keung, who drafts the USB Interface Power Bank, said in an interview with reporters that the industry standard specifies the actual discharge capacity in the hope that enterprises will make the information more transparent to consumers: "If the standard is implemented, the enterprises will mark the actual Capacity, consumers can make a pre-decision on how many times the mobile power can charge their device before purchasing. "

In early May, China Chemical and Physical Power Industry Association conducted a sampling test on 20 mobile power sources. The results showed that the effective discharge capacity averaged 60% and the highest was 70%. Association Secretary-General Liu Yanlong told reporters: "In the past, there was no relevant standard for mobile power , Enterprises are marked by the battery capacity, so the actual capacity of the test can not reach the marked value, does not mean that these mobile power failed.

"Was" misread "conversion efficiency

In addition to capacity, conversion efficiency is also a frequent occurrence in mobile power ads. Unlike most people's understanding, it is not the same as the actual capacity of the mobile power supply with the nominal capacity ratio, but refers to the power loss through the mobile power protection board when it is in the overall loss of large Part. This means that the higher the conversion efficiency of the mobile power supply, the smaller the power consumption.

In the newly released industry standard, the conversion efficiency is required to be greater than 85%. From "Consumer Reports" test results, the Philips DLP10800 outstanding performance, which may come from its excellent technology and design, and the Patriot A110 conversion efficiency is low, barely pass. (As shown below)

"The standard conversion efficiency test method is the conversion efficiency of the circuit board from the actual output voltage and current and the actual input voltage and current ratio calculated from it with the circuit board design, materials, line impedance and other factors This indicator has no relation with the capacitance because it does not involve batteries. "Kwan Seung-keung said," We set the conversion efficiency standard at 85%. We hope that enterprises will pay attention to the design of circuit boards and enhance the efficiency of mobile power supplies. "

As a result, Liu Weifan, a product officer of Guangdong PISEN Electronics Co., Ltd., told reporters: "After the release of the standard, PISEN, as one of the standard drafting units, will work hard with relevant departments to promote the implementation of standards." However, he also Frankly, just by the power of a business can not change the industry's environment.

Liu Yanlong said in an interview: "Although the current mobile power standard is the industry association standard, but we also encourage enterprises to implement this standard." The main domestic mobile power companies, 000 Extension Electronics (electricity second), PISEN, a record Ming, Changhong, Lenovo, Luo Shi Shi, Lube, etc. have promised to start the new products from September 1, 2014. The new products will be implemented in accordance with the industry standards. The association declared to the Ministry of Industry and Information Technology in June 2013 that if the project was approved , The association standard will be converted into the recommended national standard, which will greatly promote the standardization and development of the entire industry. "