Does the emf of a battery remain its specified value for a long time?

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SUMMARY

The electromotive force (emf) of a battery does not remain constant over time, particularly during discharge. As a battery discharges while connected to an external resistor, its emf value decreases due to the depletion of chemical reactants within the battery. Initially, the emf increases from zero to its specified value during charging, but continuous use leads to a gradual decline in emf until the battery is fully discharged.

PREREQUISITES
  • Understanding of battery chemistry and electrochemistry
  • Knowledge of electromotive force (emf) principles
  • Familiarity with battery discharge characteristics
  • Basic concepts of electrical circuits and resistors
NEXT STEPS
  • Research the chemical reactions occurring in lithium-ion batteries
  • Study the impact of load resistance on battery discharge rates
  • Learn about battery management systems (BMS) for monitoring emf
  • Explore methods for extending battery lifespan and performance
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Electronics engineers, battery researchers, and anyone involved in the design or maintenance of battery-powered devices will benefit from this discussion.

sArGe99
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Does the emf of a battery remain its specified value for a long time. It is under discharging when connected to the external resistor, so shouldn't its emf value continuously decrease in that case?

A battery's emf value increases from 0(completely discharged state) to the specified value. Isn't this what's called charging?
 
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sArGe99 said:
Does the emf of a battery remain its specified value for a long time. It is under discharging when connected to the external resistor, so shouldn't its emf value continuously decrease in that case?

A battery's emf value increases from 0(completely discharged state) to the specified value. Isn't this what's called charging?

Well the chemicals within the battery can run out, that is why the emf decreases over time. Which is why batteries run out of energy.
 

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