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Internal Resistance
Internal Resistance
Read the Technical Bulletin

• The internal resistance (IR) of a battery is defined as the opposition to the flow of current within the battery.

• There are two basic components that impact the internal resistance of a battery; they are electronic resistance and ionic resistance. The electronic resistance plus the ionic resistance will be referred to as the total effective resistance.

• The electronic resistance  encompasses the resistivity of the actual materials such as the metal covers and internal components; as well as, how well these materials make contact with each other. 

Ionic resistance is the resistance to current flow within the battery due to electrochemical factors which include electrolyte conductivity, ion mobility, and electrode surface area. 

Calculation – dual pulse method

• Using Ohm’s Law, V=IxR, the total effective resistance is calculated by dividing the change in voltage by the change in current: R=ΔV / ΔI. IR



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