Print 29 comment(s) - last by supertrekie.. on Jun 16 at 11:05 AM

Mixture of battery tuning and firmware innovations could deliver 3 to 5 times longer battery life

While the poaching of Microsoft Corp.'s (MSFT) top scientists by Google Inc. (GOOG) and other rivals has made headlines in recent years, Microsoft still appears to have plenty of brainpower in the stable at its long-term R&D unit, Microsoft Research.
I. Batteries Within Batteries
Similar to Google X Labs, Microsoft Research focuses on solutions that are often highly unorthodox and seemingly years away from commercialization yet might make a major splash in key segments.  An example of a matured Microsoft Research effort was Photosynth -- Microsoft's mind-bending software that generates 3D scenes from 2D images.
Among the most intriguing projects of current Microsoft Research team members is the work of senior mobility research Ranveer Chandra.  Mr. Chandra joined Microsoft in 2005 after receiving his Ph.D in computer science from Cornell University for research focused on wireless stacks.
Today, Mr. Chandra's work is still focused on mobile devices, but on one of the mobile industry's biggest shortfalls -- battery life.  Today’s most powerful smartphones and tablets require daily recharges.  Mr. Chandra's goal is highly ambitious and specific -- to deliver smartphone technology that takes battery life under average daily use from around a day or two to a full week.

Ranveer Chandra
Microsoft Research senior scientist Ranveer Chandra wants smartphones that can go for a week without a recharge. [Image Source: Microsoft]

In other words, he wants to make smartphone battery life around 3 to 5 times greater than what is currently available.
Part of that increase could come from improved battery chemistries, but Mr. Chandra isn't holding his breath.  He points out that battery capacity has only doubled in the past 15 years.  Presenting on his research at the MIT Technology Review’s Digital Summit in San Francisco, he told the audience:

You can’t just wait for the best battery technology to come along.  We can make a lot of progress because systems today don’t use battery intelligently.

His most innovative idea is to produce a battery with two or more individual cells or segments tuned for different power consumption levels.  Today's smartphones have a single battery that supplies current at what is considered an "average" load.  In smartphone terms, typically this means an average use case when the phone is on.
Heat and electrical leakages diminish any battery from its ideal theoretical capacity.  Batteries see the lowest level of waste -- and highest level of energy efficiency -- when operating at the current they're tuned to.  The problem when it comes to smartphones is that at low power (standby), the hardware is typically drawing too little current and wastes more power, as a result.  On the flip side, when under an unusual heavy load (e.g. a pocket 3D-game) the phone may draw more than the battery's standard current, causing it to heat up and waste power.
Mr. Chandra's initial concept involves using two lithium ion batteries -- one for standby current levels; the other for current levels at higher performance.  In tests this seemingly simple change increase a smartphone's battery life by 20 to 50 percent.
While he didn't go into details, it's reasonable to extrapolate that eventually the principle could be extended to subdivisions of the active power cell into multiple current levels -- perhaps one for very low power activities (reading texts, etc.), one for medium power activities (internet browsing), and one for very graphically intensive activities (HD video, 3D gaming).  Also, as standby power is typically consumed while the phone is sitting in your pocket (poorly ventilated) and active power is typically consumed when the phone is sitting in your hand (well ventilated), the standby cell could be tuned to operate under poor ventilation conditions.
II. Smarter Multitasking
While that technology hasn't made it to the commercial phase yet, Mr. Chandra's firmware work has started to trickle into use.  One of his projects is E-Loupe -- a piece of OS firmware that essentially does predictive multitasking.  It watches app usage in order to predict which currently unused apps aren't likely to be used for some time.  Those apps are then either paused or slowed down.  E-Loupe uses a cloud database of a plethora of Windows users in order to generate smarter predictions, even before your device learns the quirks of your particular usage patterns.
Battery prediction
Microsoft's E-Loupe uses the cloud to optimize multitasking power consumption.

Windows 8 incorporates a rudimentary version of E-Loupe into its laptop power management firmware.  It watches how much computing resources (and by proxy power), an app uses and then uses that information to control CPU frequencies (and power consumption).

It will take a lot of work to achieve the dynamite goal of a 3-5 times battery life improvement in the timeframe Mr. Chandra desires -- the next several years.  But Microsoft appears to be in striking distance of those goals, if he is able to properly mature his current mixture of hardware (battery tuning) and firmware (predictive task pausing/backgrounding, CPU clockspeed control).

If Windows Phones could run for a full week on a single charge under normal use and Microsoft held the patents to make that capability exclusive, that could be a game changer for Microsoft's smartphone ambitions.

Source: MIT Technology Review

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RE: frist step
By retrospooty on 6/13/2014 10:31:56 AM , Rating: 2
"Dont use retarded screen resolutions (1440p) like LG G3"

So... The bast battery life in the industry is your bad example?

"I have a 1080p nexus 5 and i still think 720p for 5'' screen is more than enough."

Enough for you maybe, that is fine, but please understand that if you cant see the difference from 720 to 1080 on a 5 inch screen then you have an issue with your close range vision.

RE: frist step
By Motoman on 6/13/2014 12:54:07 PM , Rating: 2
Some day I can only hope you'll stop lying about that.

You want uselessly high resolutions on tiny screens, fine - knock yourself out. But please stop your assaults on people who point out that there's not actually any benefit by telling them there's something wrong with them.

The *vast* majority of people do not care what the resolution is on a phone, and can see with their own eyes that it doesn't make any difference, and I've proven this in the real world and have described the process several times and you can do it on your own to prove it to yourself.

RE: frist step
By retrospooty on 6/13/2014 6:47:02 PM , Rating: 2
What lie? There is a difference and if you cant see it there is something wrong with your near term vision. It's not an insult... Half the country wears glasses. It's not abnormal.

If you say you don't care, about the quality difference from 720 to 1080 on a 5 inch phone, fine. I believe you. If you say you cant see a difference, there is something wrong with your near term vision period, end of story. You don't see what you cant see because your eyes are not working well at that distance.

RE: frist step
By CyranD on 6/15/2014 8:57:48 AM , Rating: 3
Taking this from a scientific approach here a approximation of what someone is capable of seeing.

There 3 factors
1. Your eyes sight
2. DPI of the screen
3. Distance from the screen

For this calculation am going to show 20/20 vision and just for comparison the theoretical max a unaided human eye can see 20/8.

20/20 = ~0.016666 arc minutes (in degrees)
20/8 = ~0.00666666 arc minutes (in degrees)

Formula for max dpi
=1/(2*Distance(in inches)*TAN((arc minutes/2))))

**make sure you do the calculation in degrees. Many calculators will assume radians. If using excel for example you have to write the formula like
=1/(2*Distance*TAN((RADIANS(arc minutes/2))))

if distance equal 6 inches you get
20/20 = 573
20/8 = 1432

6 inch cell phone DPI
1080 DPI= = (SQRT(1920^2+1080^2))/6 = 440.6

440<573 so someone with 20/20 vision at 6 inches should be capable of seeing a resolution greater then 1080.

I also showed 20/8 just to make the point that your vision have a huge impact on what the max resolution is you can see. It is very possible that when one person says they cant see the difference and another person says they can that they both telling the truth.

RE: frist step
By Jeffk464 on 6/15/2014 10:31:13 PM , Rating: 4
6" is really uncomfortable for focusing, I probably hold my phone somewhere between one to one and a half feet away.

RE: frist step
By supertrekie on 6/16/2014 11:05:30 AM , Rating: 1
All that math and you don't understand the difference between DPI and PPI?

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