20 charging treasure 4 capacity virtual standard "2W Ma capacity" measured only 1.2W


20 charging treasure 4 capacity virtual standard

Guangdong Provincial Consumer Council released the report on comparison test of mobile power performance in 2018.

20 charging treasure 40% capacity virtual standard "2W Ma capacity" measured only 1.2W

Source: Southern Metropolis Daily

Time: March 2018 to August

Organizer: Guangdong Consumer Council and Maoming Consumer Council

Testing samples: 20 brands, 20 models (purchased randomly from retail stores and counters by the staff of the Consumer Council as ordinary consumers)

Nominal capacity: from 6000 Ma to 20 thousand ma.

Sample price: from 136 yuan to 175 yuan / month.

Test items: rated capacity and conversion efficiency

Testing basis: According to GB31241-2014 "Safety Requirements for Lithium-ion Batteries and Batteries for Portable Electronic Products" and CIAPS0001-2014 "USB Interface Mobile Power Supply", the "Performance Comparison Test Scheme of Mobile Power Supply" was formulated.

(The comparative test results are only responsible for the samples and do not represent the quality status of different models and batches of the same brand.)

The Mid Autumn Festival is short and the National Day holiday is near. Do you plan to go there? But whether you're out shopping, or out traveling, visiting relatives and friends, the most scared except everyone, should be the red cell phone power bar. So many people need to recharge their batteries. But on the market, there are many kinds of charger brands, good and bad quality, declaring that "2W milliampere large capacity" charger, the rated capacity must be many? How should consumers choose to buy mobile power? Recently, the Guangdong Provincial Consumer Committee released the "2018 Mobile Power Performance Comparison Test Report" to test the performance of the two indicators - rated capacity and conversion efficiency.

Identification record

Rated capacity

Kimberley's nominal 10800 Ma measurement is only more than 2000.

After a few minutes of charging, the mobile power that just got full is gone. This may be the virtual capacity of mobile power. Engineers said that the capacity of mobile power basically determines the discharge time and the number of charges to other electronic devices, is an important indicator of consumer concern, "but because of the mobile power conversion and protection circuit, the rated capacity of mobile power does not equal the actual use of discharge capacity." Referring to the standard G B31241-2014 "Safety Requirements for Lithium-ion Batteries and Batteries for Portable Electronic Products" and CIAPS 0001-2014 "U SB Interface Mobile Power Supply", the actual discharge capacity should meet the manufacturer's specified rated capacity.

The test results show that 12 of the 20 mobile power supply samples have discharge capacity up to or exceeding the nominal rated capacity, the most prominent performance is Hailutong J120, the measured capacity is 106.6% of the rated capacity; Tai Dian, Yubo, Huawei samples are also good performance, the measured capacity exceeds the product rated capacity.

However, the actual discharge capacity of 8 samples does not conform to the rated capacity specified by the manufacturer, accounting for 40% of the discrepancies. There are serious discrepancies in the samples of Haiyun P108, PRODA, TZY and Kimberley. The ratio of measured capacity to rated capacity is lower than 70%. The only PRODA with a nominal value of 20,000 mA is only more than 12,000 mA. The most serious problem is Kimberley, which claims a capacity of 10,800 mA, only 2214 mA, and only 20.5% of the nominal capacity. It is reported that the Provincial Committee for Consumer Protection has urged the relevant enterprises to pay attention to and actively rectify the problem.

Conversion efficiency

The 20 Rome standards are charging fastest.

Why do some charging treasure can "fast charge", and some charging speed is slower than tortoise? It is reported that in the process of charging mobile power for mobile phones and other digital products, the operation of the internal circuit will consume a part of electricity, so the conversion efficiency directly affects the actual energy output when the mobile power is used.

According to CIAPS 0001-2014 "USB interface class mobile power supply" standard requirements, mobile power conversion efficiency should not be less than 85%. The results show that the 20 mobile power supply participating in the comparative test sample conversion efficiency is higher than 85%, the overall performance is good. Among them, Romans had the highest conversion efficiency, 92%; Borido and Kimberley were at the bottom of the list, with only 88% charging efficiency.

Consumer reminder

Dual port output is not practical.

Most of the voltage is insufficient to affect charging speed.

(1) shopping at regular shopping malls. Large-scale formal merchants mostly have their own product access mechanism, if the product wants to enter the sales channels of regular shopping malls, generally need to provide the corresponding certification or testing report, so for consumers, has a certain degree of security.

(two) purchase products with complete logo. Regular products should be marked with product name, model, rated capacity (energy), battery energy (capacity), plant name or trademark; input and output ports should have port name and rated voltage, current value; packaging marked with safety warning, production date or batch number, plant name and factory address.

(three) the dual port output product is not practical. Some mobile power models have two USB output ports, which is often a big selling point for merchants, but most of the dual-port charging when the output voltage is insufficient, but slow down the charging speed, increase the charging time.

(four) preferred lithium polymer core products. At present, the main batteries used in mobile power supply are nickel-hydrogen batteries, lithium iron phosphate batteries, liquid lithium ion batteries and lithium polymer batteries. The efficiency of the first two kinds of cores is low and it is not recommended to buy. The output performance of liquid lithium ion battery and lithium polymer battery is relatively stable, especially the lithium polymer battery has the characteristics of light weight, safety and high efficiency.

(five) check the core level and production date. The cores usually have class A and B. Class A is a brand new qualified battery. Class B is a battery that has been in stock for more than three months or has been repaired. If the battery is in stock for more than three months, it will decay to Class B because of its chemical characteristics. When buying, you should pay attention to the production date of the core, and try to buy A-class electric core products.

(six) there must be a "overcharge and overdischarge" protection circuit. The mobile power supply should have "overcharge and overdischarge" protection circuit to play a protective role. The output voltage should be as close as possible to the 5V voltage of the standard U SB interface, so as to have higher conversion efficiency, as small as possible voltage fluctuation range and lower charging and discharging temperature.

(seven) purchase high conversion efficiency products. The conversion efficiency of mobile power supply is very important. If the conversion efficiency is too low, the energy utilization rate is not high, the line loss is large, and the heating is likely to be high.

Production: Nandu appraisal Laboratory

Host: Chen Yangkai

Nandu reporter Chen Yangkai

Intern Yang Liyun Xie Xiaoshan

Correspondents in Guangdong


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