What are you really measuring as a battery discharges?

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    Battery Measuring
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SUMMARY

This discussion focuses on the measurement of battery power in devices, specifically addressing how battery levels are displayed as graphics or percentages. It clarifies that these measurements typically reflect voltage and amp hours remaining, with an emphasis on the impact of internal resistance on voltage drop during discharge. The conversation highlights the importance of internal monitoring circuits in lithium-ion batteries, which provide accurate charge and discharge data to the operating system, ensuring reliable performance metrics.

PREREQUISITES
  • Understanding of lithium-ion battery technology
  • Knowledge of voltage and amp hour concepts
  • Familiarity with internal resistance in electrical components
  • Basic comprehension of battery management systems
NEXT STEPS
  • Research lithium-ion battery management systems and their functionalities
  • Learn about voltage drop characteristics under load in batteries
  • Explore external battery monitoring techniques and tools
  • Investigate the role of internal resistance in battery performance
USEFUL FOR

Electrical engineers, battery technology enthusiasts, and anyone involved in the design or optimization of battery-operated devices will benefit from this discussion.

ptownbro
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Think for example a phone or any devices that shows the amount of battery power is left. It shows it as a graphic where you can deem whether it's full, 3/4 full, 1/2 full, 1/4 etc... or shows the actual percentage. What is that measure really showing you? Voltage? Amp hours left (which is the capacity I think)? And, how is it calculated?
 
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As a battery discharges the voltage drops under load. This is mostly due to internal resistance increase.
http://www.mpoweruk.com/soc.htm discusses it. It's possible to monitor this externally.

But. most LI-ion batteries have an internal monitoring circuit that reports charge and discharge data back to the operating system. This is best because the data is so battery dependent.
 

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