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How do I check the voltage of my laptop battery with a multimeter? 

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Compared with the existing battery model parameter identification method, this study proposes a new online estimation method and which can estimate the battery open-circuit voltage in different sampling intervals with high accuracy.
Requirements vary somewhat for each type of battery, but a typical voltage monitoring system should meet specifications similar to those listed below.
In this paper, a computationally feasible two-step estimation approach is proposed that only uses voltage and current measurements of the battery under consideration.
The sample entropy calculated from discharge voltage curve can serve as an indicator for assessing the condition of battery.
For these reasons, the cell voltage levels should be individually monitored and effectively balanced in the battery string.
Proceedings ArticleDOI
23 May 2005
15 Citations
This paper presents a model that can accurately predict the battery voltage given current over time.
The comparison results indicate that the SPM-EKF approach can obtain a reliable battery voltage response and a more accurate SoC estimation than other approaches.
The developed model was verified using static and pulse discharge profiles, showing a good accuracy in predicting the voltage of the tested Li–S battery cell.
The results include improved battery voltage predictions that provide the basis for more accurate state-of-function readings.
The comparison of measured and simulated voltage profiles indicates an excellent performance of the battery model.

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