Battery Internal Resistance Chart

As a battery ages, its internal resistance increases. This resistance is an important factor in determining the battery’s overall health and performance. Battery internal resistance can be measured with specialized equipment, and the results are often presented in a chart form.

Battery Internal Resistance Chart

Battery Internal Resistance (mΩ) Battery Type Typical Maximum
Sealed Lead Acid 2V 0.125 0.25
Sealed Lead Acid 6V 0.25 0.50
Sealed Lead Acid 12V 0.50 1.00
Lithium-Ion 2V 0.02 0.04
Lithium-Ion 6V 0.04 0.08
Lithium-Ion 12V 0.08 0.16
Nickel Metal Hydride 1.2V 0.030 0.060
Nickel Metal Hydride 2V 0.060 0.120
Nickel Metal Hydride 4V 0.120 0.240
Nickel Metal Hydride 6V 0.180 0.360
Nickel Metal Hydride 12V 0.360 0.720
Nickel Cadmium 1.2V 0.030 0.060
Nickel Cadmium 2V 0.060 0.120
Nickel Cadmium 4V 0.120 0.240
Nickel Cadmium 6V 0.180 0.360
Nickel Cadmium 12V 0.360 0.720

What is good internal resistance of battery?

A good internal resistance for a battery depends on its type and size. Generally, a lower internal resistance indicates a healthier battery. For example, a good internal resistance for a lead-acid battery is around 5 milliohms, while a lithium-ion battery’s resistance should be under 150 milliohms.

What is the average internal resistance of a battery?

The average internal resistance of a battery varies depending on the type and size of the battery. For example, an average internal resistance for a lead-acid battery is around 10 milliohms, while a lithium-ion battery’s average resistance is around 50 milliohms.

What is the normal internal resistance of a 12v battery?

The normal internal resistance of a 12v battery can vary depending on the type and age of the battery. However, a healthy 12v lead-acid battery should have an internal resistance of around 3-5 milliohms.

What is the internal resistance of a bad battery?

A bad battery will have a significantly higher internal resistance than a healthy battery. For example, a lead-acid battery with an internal resistance of 20 milliohms or above is considered bad. Similarly, a lithium-ion battery with an internal resistance over 250 milliohms is considered bad.

Conclusion

Understanding battery internal resistance is crucial for determining the overall health and performance of a battery. By using a battery internal resistance chart, you can easily monitor the internal resistance of your battery and identify any potential issues before they become a problem. Remember, a lower internal resistance indicates a healthier battery, while a higher internal resistance indicates a bad battery that needs to be replaced.

About the author, Phil Borges

Phil Borges is a battery aficionado. He's written extensively about batteries, and he loves nothing more than discussing the latest innovations in the industry. He has a deep understanding of how batteries work, and he's always on the lookout for new ways to improve their performance.