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How to check laptop battery voltage with multimeter? 

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Requirements vary somewhat for each type of battery, but a typical voltage monitoring system should meet specifications similar to those listed below.
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.
The proposed method utilizes the direct voltage measurements from the battery cells, and does not require any additional hardware or effort in modeling during fault detection.
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.
In this paper, a computationally feasible two-step estimation approach is proposed that only uses voltage and current measurements of the battery under consideration.
Proceedings ArticleDOI
23 May 2005
15 Citations
This paper presents a model that can accurately predict the battery voltage given current over time.
The results include improved battery voltage predictions that provide the basis for more accurate state-of-function readings.
The validation results show that the on-line calibrated model can accurately predict the dynamic voltage behavior of the lithium-ion battery.
The comparison of measured and simulated voltage profiles indicates an excellent performance of the battery model.