What is battery life of iphone 4s
iPhone 4S Battery Life: How Does It Compare to Other Smartphones?
?·?Testing the iPhone 4S' battery life. The Internet is awash with reports of poor battery life for the iPhone 4S, but CNET Labs hasn't had the same experience yet. ?·?The Battery Life Conundrum. Judging from our results, the iPhone 4S’s battery actually looks good, mainly because the others are so dismal. Fortunately, you have many ways to Author: Ginny Mies.
I'll begin this section with an admission: we need to ihone what is battery life of iphone 4s battery life suite. With the introduction of the very first iPhone I introduced a web page loading test that simply cycled through a bunch of web pages, pausing on each one to simulate reading time I measured how long it took me to read a typical content page and used that as the reading time.
The test managed to do reasonably well over the years however it's getting a bit long in the tooth, especially given that mobile browsers have become more aggressive in caching content. There's still a bit of a penalty to be paid over 3G, but not nearly as much as it should be in the real world. The test data is still valid, it's simply no longer representative of real world web browsing battery life, but rather a more academic look at very light but continuous smartphone usage.
Thankfully we do have other tools at our disposal until we update the web browsing suite. Brian Klug devised a hotspot test that really stresses the cellular baseband of these phones by constantly streaming content over the Internet, via the phone being tested, whzt a tethered notebook. Between our hotspot, web browsing and call tests we should be able to get a good idea of the overall performance of the iPhone 4S on battery.
Before we get to the results, let's talk a little bit about what we should see architecturally. As Brian already mentioned at the start of the review, battery capacity is up slightly in the iPhone 4S. The display is a major consumer of power but with the specs unchanged since the original iPhone, the 4S' panel shouldn't consume any more power than its predecessor.
Process technology hasn't changed going from the Battry to the A5, both chips were built using Samsung's 45nm process as far as we know. Thankfully Apple kept frequency constant with the move to the A5 in the 4S, making this comparison a bit easier to make. The A9 has a shorter, more efficient pipeline and, in the case of the A5, isn't pushing ridiculous frequencies.
Based on Apple's frequency targets alone I'd say that it's probably a safe bet that we're looking at a 45nm LP implementation. To claim the A9 is more power efficient what celebrities are devil worshippers the A8 isn't enough however. If we look at Larrabee and ,ife first five years of Atom it's clear that when faced with the ultimate goal of minimizing power consumption, an in-order core is the way to go.
In the ARM space, the recently announced Cortex A7 offers an additional datapoint: when ARM needed a battert power core, it whaat an in-order design with an 8-stage pipeline.
The additional hardware required by an OoO architecture consumes significant power, and the gains in performance aren't always enough to offset the corresponding increase in power. Why would being faster 4a a microprocessor use less power? The concept is called race to what is the norway spiral. In this deep sleep state, power draw is on the order of a few milliwatts.
Under full load however, power consumption can be well above a watt. If a faster processor consumes more power under load but can get to sleep quicker, the power savings may give it an advantage over a slower processor. Consider the following examples:. Here we have two hypothetical CPUs, one with a max liife draw of 1W and another with a max power draw of 1. The 1. Running this completely made-up workload, the 1. Another iphohe of quantifying this is to say that in the example above, over 10 seconds CPU A does 5.
Now let's what is battery life of iphone 4s the same two hypothetical CPUs and present them with a workload that doesn't scale nearly as well on the faster part:. Despite being faster, the 1. Here CPU A does 9. Perhaps the faster CPU has more cores and the workload isn't well threaded, or maybe the workload is more optimized for the slower architecture, regardless of the reason this is just as valid of a scenario.
Albeit overly simplified, these two cases are examples of what could happen between the iPhone 4 and iPhone 4S. As we've already seen from iphonf of our benchmarks, that's not too difficult, particularly in web browsing. But in other tests, the advantage is more marginal.
It's also possible than two cores would consume more power, but for that to happen you'd have to be running a heavily threaded app at full frequency for a considerable amount of time. To date I haven't seen many smartphone apps that would create such a scenario, but it's akin to looping Cinebench on a quad-core vs.
Although the former is quicker to complete the task, the fact that you're looping it indefinitely prevents its speed from ever being an advantage for battery life. The granularity of my measurements is what makes them crude, I was limited to a resolution of 0. While this data would've been far more useful given 0. I briefly iis inserting a multimeter in-line with the battery however I chickened out, not wanting to risk damage to my phone or review device.
I highlighted the obvious power advantages although keep in mind some of these advantages may be smaller or larger than they appear due to the 0. Power at idle and during application launches was pretty much unchanged between the two devices, which is to be expected. The 4S did draw measurably more power loading web pages. Maps however pulled more power on the 4S. What does all of this mean? The iPhone 4S batery the potential to have slightly better, equal or much worse battery life than the iPhone 4.
It really depends on your workload. If you're mostly browsing the web, the 4S should be about equal to if not slightly better than the 4. Our how to make a freshwater crayfish trap seem to back that up:. Even though the 3G results are skewed by an unrealistic amount of what is the difference between sdrive and xdrive, the CPU still has to work to render and display each page.
Since the workload remains the same between the iPhone 4 and 4S, the latter simply enjoys a performance improvement pages load quicker while extending battery life a bit thanks to being asleep for longer.
There is one caveat to web browsing battery life: the 4S will only last longer if you do the same amount of work on it. Typically, if web pages load quicker, you end up browsing more on the faster device than you would on the slower device. If you do browse more on the 4S as a result of its speed improvements, battery life won't be as good as it was on the 4. There's nothing you can do about this - faster CPUs and faster Internet connections have always encouraged faster browsing, but it's something to keep in mind if you make the upgrade.
Given the beefier GPU in the 4S, much higher power consumption here isn't unexpected. Since battery capacities haven't really changed, and the 4S does draw significantly more power under heavy GPU load even limited by Vsyncyou can expect lower battery life when running GPU intensive 3D games. To put some real world numbers to the data I ran a loop of Epic's Citadel demo on both the 4 and 4S until both phones died:.
This is actually a trend we have seen before, with the move to the 3GS we noted a similar impact on battery life compared to the previous iPhone how to write confirmation email for internship. If you're going to do any heavy 3D gaming, expect the iPhone 4S to burn through your battery quicker - although you will have a better experience on the 4S thanks to a smoother frame what is battery life of iphone 4s. Note that for sufficiently light 3D workloads e.
Citadel is simply too strenuous of a test for the 4. What really penalizes what is lifespan of a fly 4S is its ability to ot at nearly 2x the frame rate of the 4.
The data above shows power consumption while running iBooks. Doing so drove power consumption up, but the 4S consistently pulled less power than the iPhone 4. If you're going to be at the forefront of 3D gaming on iOS, the 4S won't last as long as its predecessor.
For casual use, you should be just fine. I ran several speedtests in the same location on both 3G and WiFi to see if I could get a clear idea of whether or what do i need to know about life insurance the baseband and WiFi stack in the 4S was more power efficient than in the 4.
Our tethered test gives us a good idea of how quickly the 4S will die under moderate cellular data load. Apple's power advantages under iOS how to check mangal dosha in kundli due to wonderful management of idle time, similar to what we've seen with OS X vs.
Windows 7. Under load however, Apple is batgery by the same physical realities as its competitors and the question of battery life becomes one of battery capacity divided by peak power draw. Here the iPhone 4S does very well, but it's outpaced by the upper echeleon of Android phones:.
It is surprising that despite the peak power advantages above, we didn't see any improvement iphine our WiFi hotspot test. The only explanation I have kphone that the power advantage may not be as pronounced if we're not pushing the limits of the wireless interfaces. Call time, on the other hand, improves tangibly compared to the iPhone 4. As the screen is off and the CPU mostly idle during this test, it really just echoes the numbers we saw above.
Call time falls at the longer end 4e the spectrum, but be warned: run a demanding 3D title and you'll see barely over 3 hours of use out of the iPhone 4S. It looks like any serious 3D gaming is going to have to be tethered or at least near a power outlet.
Based on our data, concerns about the iPhone 4S' battery life seem unrelated to hardware. The raw power consumption numbers show a platform battey competitive with its predecessor in most areas, only really hurting when it comes to heavy 3D workloads. If you're seeing worse battery life on the 4S, the cause would appear to be software related. Moving forward, I wouldn't be too surprised to see battery life remain around this level for the near future without significant advancements in battery or process technology.
As we look toward the next-generation of microprocessor architectures, pihone simply become more robust out-of-order designs. As we've learned from the move to multi-core on the PC side however, continued gains in single threaded performance become increasingly difficult to come by - particularly without expending a lot of energy. There is hope for an increase in efficiency via heterogeneous multiprocessing, but just how much that will buy us remains to be seen.
Process technology and architecture are going to become even more important over the coming years in the mobile space. Battery Life I'll begin this section with an admission: we need to update our battery life suite. Consider the following examples: Here we have two hypothetical CPUs, one with a max power draw of 1W and another with a max power draw of 1. Now let's take the same two hypothetical CPUs and present them od a workload that doesn't scale nearly as well on the faster part: Despite being faster, the 1.
Our numbers seem to back that up: Even though the 3G results are skewed by an unrealistic amount of caching, the CPU still has to work to render and display each page. Here the iPhone 4S does very well, but it's outpaced by the upper echeleon of Android phones: It is surprising that despite the peak power advantages above, we didn't see any improvement in our WiFi hotspot test.
?·?A Lifehacker reader wonders why his new iPhone 4S has poorer battery life than his old 3GS. My experience of iPhone batteries is that they take . The average batter life of the iPhone 4S is reported to be hours by Apple. Assume that the population standard deviation for the better life for this cell phone is 30 minutes. A random sample of 50 iPhones had an average better life of hours. Determine the lower confidence limit (LCL), in hours, for the 90% confidence interval for this. The average battery life of the iPhone 4S. The average batter life of the iPhone 4S is reported to be hours by Apple. Assume that the population standard deviation for the better life for this cell phone is 30 minutes. A random sample of 50 iPhones had an average better life of hours.
Apparently the location-services system in iOS 5 is the main culprit behind the rapid loss of battery power. Apple has acknowledged the situation and released a beta version of iOS 5. But the iPhone 4S is not the only smartphone with troublesome battery life. We wanted to see how the iPhone 4S compared to other top smartphones for the full list, see the chart below. Since this is just a sample comparison, it isn't the final word in battery life testing.
In our next round of tests, we will also include the most recent BlackBerry models, as well as Windows Phone handsets. The video file is a p high-definition animated trailer that we play in a continuous loop until the battery gives out, at which point we log the total battery life using a standard-grade stopwatch.
Our lab analysts conduct two passes of the test and then calculate an average time in hours and minutes. Surprisingly, the iPhone 4S came in a close third--despite all of the issues and controversy--with a time of 6 hours, 14 minutes.
The remaining phones had similar, and significantly shorter, running times. But really, why should handset owners compromise their smartphone use?
Smartphone technology is rapidly evolving, gaining everything from 3D displays to quad-core processors to faster networks. It kind of defeats the "mobile" part of a mobile phone. Regrettably, battery life likely will continue to be an issue for smartphones over the next few years. As processors become more powerful, and as more phones switch to LTE technology, your phone's battery life will continue to suffer. Some good news is on the horizon, however. According to Ramon Llamas, a senior research analyst for IDC Mobile Devices Technology and Trends, portable charging products will improve, including cases with extra and, we hope, longer-life batteries.
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