Online MEMS-Based Specific Gravity Measurement for Lead-Acid Batteries


  • Yashwant Gulab Adhav Department of Instrumentation and Control Engineering, Cummins College of Engineering for Women, Pune, India
  • Dayaram Nimba Sonawane Department of Instrumentation and Control Engineering, College of Engineering, Pune, India
  • Chetankumar Yashawant Patil Department of Instrumentation and Control Engineering, College of Engineering, Pune, India



Kordash chart, lead-acid batteries, MEMS, specific gravity, temperature compensation


Traditional methods for measuring the specific gravity (SG) of lead-acid batteries are offline, time-consuming, unsafe, and complicated. This study proposes an online method for the SG measurement to estimate the state-of-charge (SoC) of lead-acid batteries. This proposed method is based on an air purge system integrating with a micro electro mechanical system sensor. Through the proposed strategy, the SoC measurement achieves up to ±1% accuracy. The technique has an SG accuracy of ±0.002% which is better than the glass hydrometer accuracy of ±0.005% in the battery charge reading. The experimental results show that the high accuracy and precise measurements of SG and SoC can be conducted by using the proposed method.


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How to Cite

Yashwant Gulab Adhav, Dayaram Nimba Sonawane, and Chetankumar Yashawant Patil, “Online MEMS-Based Specific Gravity Measurement for Lead-Acid Batteries”, Adv. technol. innov., vol. 8, no. 2, pp. 136–149, Apr. 2023.