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April 26, 2024

Discharge tests of 9 Volt transistor radio style batteries

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Testing 9 Volt Batteries for mAH capacity and voltage sag during discharge


1. New Batteries were purchased from a retailer to make sure they were fresh and had full battery capacity.

2. This test is not to compare batteries for normal operation, they are designed for very low current draw and these tests are for high current draw. This information is to help design engineers know what to expect when the batteries are used under these circumstances.

3. The performance rankings may be different for low current applications.
Summary of tests, see discharge curves below
Size Brand Code used in Graph Termination voltage used in test 9V battery Amp-Hours at 100 mA Discharge rate 9V battery mAHs at 500 mA Discharge Rate Amp-Hours at 1000 mA Discharge Rate
9 Volt Alkaline Duracell Coppertop DC 0.1 Volt 310 mAH 170 mAH 90 mAH
9 Volt Alkaline Duracell Procell DP 0.1 Volt 310 mAH 170 mAH 90 mAH
9 Volt Alkaline Energizer Industrial EI 0.1 Volt 450 mAH 330 mAH 230 mAH
9 Volt Alkaline Nuon NU 0.1 Volt 490 mAH 280 mAH 300 mAH
9 Volt Alkaline Rayovac Industrial Plus RI 0.1 Volt 440 mAH 290 mAH 140 mAH
9 Volt Carbon Zinc Panasonic Super Heavy Duty PS 0.1 Volt 52 mAH    

discharge tests for 9 volt battery Here are the discharge curves at 100 mA. I have thrown in a Panasonic Super Heavy Duty carbon-zinc battery, it obviously was never meant to be discharged at 100 mA.
The two Duracell batteries are now almost identical,
9 volt batteries tested at 500 mA The first thing to realize is that 9 volt batteries were never designed to operate at 500 mA. This test was for a special project.
However, it is evident that some 9 volt batteries are better than others at this high current.
9 volt alkaline transistor radio batteries discharged at 1 amp Again, these curves are really ugly, since 1 amp is a lot for these transistor radio style batteries. It looks like the EI battery started to loose the connections between cells at the high temperature. The hump in the red and green curves is where one or more of the cells emptys first.  

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