Cold wave sweeping across half of China some time ago, my Socialist successor was frozen when silly bi ~, it is estimated that many mobile phone users are ignorant force. If your friend has suddenly lost, don't worry, they are just awe-inspiring to measure what is called "cold shut" ... ...
That day, human finally back reminds had once was power insufficient by dominated of terrorist and phone didn't electric of that copies humiliation: see with also has 20% power, wild drag racing on left last a bent, to girlfriend of apologized micro-letter on poor a Word, Conan on poor a sentence words on can put killer pointed out that to, Taobao chop hand party on almost about paid, phone he Meow of actually shut machine has!!! (╯‵□′)╯ ┴─┴
Even the bottom of Maslow's theory of "power" they cannot guarantee that, also talk about from the Gallery! Even the battery indicator is our existence is: there's no more insecure? Embrace battery indicator the pit of endless grief, we decided to study important life topics: battery indicator on the phone really accurate?
Temperature test
Our prices in accordance with the selected 5 machines for testing, including the 5000-level iPhone 6s (Yes, it's "cold shut" case protagonist), the 2000 class Meizu MX5 and OPPO R7s, thousand-Yuan G7 level red rice Note3 and Huawei.
Introducing our call tool Fast and Battery discharge Monitor Widget, which can screen, Flash always and CPU frequency operation handset with fixed load discharge, while the latter is what most professional information tools, no one. Since no two iPhone software, so the use of slow motion and Flash a constant output.
In this fixed under load, the phone will power off at a linear rate, if the power curve is not linear, that obviously is the power statistics are not allowed.
At room temperature, 2000 Yuan and Qian Yuan level of several handsets are not chains, Huawei Technologies, in addition to the low end of the G7 have a certain degree of power hoax, but almost always coincides with the ideal power curve.
Low-temperature discharge test
Baby cold, baby, don't tell
Chemistry teacher told us that low temperature affects the speed and efficiency of battery chemistry, but power counting should not appear erratic or die suddenly. IPhone what what happened at low temperatures? Other phones will have an accident? We still speak with experimental data.
The test method and object is the same as above, but the test environment to 0 degree thermostat:
At low temperatures, iPhone 6s first just power off faster than usual, and curve drift often played, went to the second half with 1% stick to a half of an hour. But because the iPhone testing machine is new, and there were no frozen shut. Netizens are frozen shut because cell phone use after a period of time, power due to statistical errors.
2000-level machines, OPPO R7s power to a "step by step", but performed much better than several other machines, power degree under the influence of temperature is very light. The MX5, he was not very optimistic about next, whole machine power reports last 15% about power directly on the frozen shut.
Thousand units, red rice Note3 apart from fast early with a minor power, and the rest are best of 5 machines. But it's exaggerated power G7 next degree deviation from 25% capacity has died suddenly after ... ...
Why Mobile show different?
Apple says iPhone is actually a sudden shutdown on battery low temperature protection, but passionate power curve that floated face swollen by Apple.
Of course, as knowledge, culture, and the pursuit of four youth, there is Google, these guys are more interested in reasons for different mobile phone power counting accuracy differences, xiaobian shame shame to check the information ... ...
Full story from that humble fuel gauge on a mobile phone chip to start, members may have the impression, when Nokia brick when God, the so-called energy statistics are just a few of 3~5 lattice (pictured above). Although accuracy is very low, but a week filling device does not need much attention power. Later accompanied by really intelligent machine spread collapse of mobile phone battery, fuel gauge IC in technology upgrades, we are also a percentage battery indicator of better times.
From the former 3~5 to 100 today, accuracy has climbed more than 20 times, which the hero behind the scenes is the fuel gauge IC, but at different temperatures, different ages, different discharging current (power consumption of different tasks such as playing games, watching movies) they have available capacity fluctuations. Battery indicator accuracy is closely related to the fuel gauge, fuel gauge, however this effect of "security" component has been forgotten by everyone, information on the results of mobile phone manufacturers have no standard gauge but, we had to remove.
Teardown analysis
IPhone 6s fuel gauge hand of chips from Texas instruments, are placed in the package on the circuit board and batteries.
Specific models are special, is the Texas instruments tailored for Apple's SN27546. Marcelo Burlon iPhone Case
OPPO R7s excerpt from circuit board, using Texas Instruments ' power meter, chip placed on the independent circuit and directly connected to the battery plates, was surrounded by a bunch of sticky plastic insulation.
Specific models for the Texas Instruments BQ27541.
Red rice Note3 motherboard diagram
Red rice Note3 using game micro (CellWise) gauge, model CW2015. Chips are very small, placed in the back of the power supply cable connectors.
Meizu MX5 excerpt from circuit boards, the machine does not pick up stand-alone fuel gauge IC.
Huawei G7 excerpt from circuit boards, also did not carry stand-alone fuel gauge IC.
Fuel gauge model statistics Marcelo Burlon iPhone 5 Case
Teardown see marking on the chip and found that only 3 of the 5 phones phones using a stand-alone fuel gauge. Apple iPhone 6s, red rice Note 3, OPPO R7s used stand-alone fuel gauge, but Meizu MX5, Huawei G7 are not stand-alone fuel gauge IC, reported by the mobile phone power on CPU own estimates, low battery indicator accuracy, low temperatures there is sky in error, or even cold shutdown problems are inevitable.
MX5 battery discharge curve of the before and after comparison chart
In addition, do not use the stand-alone fuel gauge has offset problems of aging. In other words, in the course of normal use, as the battery ages, battery indicator error will continue to increase. To that end, we've included comparison of brand new and used MX5 in six months. Even at room temperature, use some time MX5, the discharge curves are something very touching off, is very routine use.
In actual use, if the phone with long battery indicator and no, that is likely to be a machine without a separate voltmeter to blame, these machines are very exaggerated power display errors may occur (MX5 don't look around, talking to you). Even more tragic is, battery the greater error, but this is exactly what we charge the most sensitive area ... ...
However, it is also a stand-alone fuel gauge, performance is also different. Red rice game micro-fuel gauge for use on Note 3, did unexpectedly well, iPhone 6s and OPPO R7s TI the fuel gauge, are markedly different performance at low temperatures. Cold shutdown event for so many years in the past, Apple's still not optimized for low temperature characteristics of fuel gauge, which is not very authentic.
The last nagging
Although user awareness is not high, but fuel gauge accuracy will directly affect our psychological forecasts of a cell phone battery life. Accurate battery indicator allows us to dare at the power of 5% playing an important phone call. If the battery indicator is inaccurate, even display 50% we will have to worry about the battery off the chains, this is related to a sense of important propositions.
But it is regrettable that, if not extreme weather, many using non-independent gauge of the phone there is no way to provide accurate battery gauge. In addition, if power calculated 10% of error, then the battery has a capacity of 10% never be able to use mobile phones battery life is reduced by 10%, the Diabetes Insipidus of battery life are not tossing.
In our talk about charging a five-minute phone call two hours before, Type c, graphite black technology, all vendor master, dare to optimize your battery indicator accuracy?
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