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

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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.