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The new software is capable of estimating the remaining battery charge within 5 percent

North Carolina State University researchers have created new software for estimating the remaining charge left in a battery. 
 
Existing software for identifying a battery's charge capacity can be inaccurate, mainly because there are so many changing factors associated with a battery's lifespan. A few are temperature, the battery's charge/discharge history, and the rate at which it's charged. These factors are usually constantly changing, so it's hard for computer software to keep up in real-time and make accurate predictions. 
 
But the NC State team fixed this by allowing data to be plugged into computer models more than once to accommodate the changing factors. The software identifies these changes, offering a more accurate estimate of the remaining charge. 
 
According to test results, the new software is capable of estimating the remaining battery charge within 5 percent. This means that if the estimate is set at 48 percent remaining battery, then the real state of charge lies somewhere between 43 and 53 percent. 
 
This could not only help users determine when their car's electric battery or batteries for a particular electronic device will die, but also help developers create longer-lasting batteries.
 
"This improved accuracy will give us additional insight into the dynamics of the battery, which we can use to develop techniques that will lead to more efficient battery management," said Dr. Mo-Yuen Chow, professor of electrical and computer engineering at NC State. "This will not only extend the life of the charge in the battery, but extend the functional life of the battery itself." 

Source: North Carolina State University



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...and for all that development...
By inperfectdarkness on 10/10/2012 3:55:18 AM , Rating: 0
what you have left is a system that's still less predictable or accurate than the old E/F gauge in your daily driver. When the needle is on E, I know I have barely 20 miles left.




RE: ...and for all that development...
By mackx on 10/10/2012 5:14:19 AM , Rating: 2
wait, 5 percent? really it's a variable of 10% right if it can go from 43-53%. so i could see 10% charge but actually see my phone go off at anytime?

soo, how much are current batteries off by?


By danjw1 on 10/10/2012 6:39:51 AM , Rating: 4
That is + or - 5% which is considered 5% accuracy. This is a basic statistical statement.


RE: ...and for all that development...
By gamerk2 on 10/10/2012 9:39:40 AM , Rating: 2
Using that argument, assuming a 16 Gallon tank of gas and 25MPG, you have about a 5% uncertainty factor with your gas gauge as well:

20 Mile Uncertainty Factor
16 Gallon Tank
25 MPG

20 Mile Uncertainty Factor / 25 MPG = .8
.8 / 16 = 5% Uncertainty Factor


By AiponGkooja on 10/10/2012 1:11:36 PM , Rating: 2
That is 5% error, not 5% uncertainty. There is very little uncertainty in something that has a consistant 5% underestimating error.


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