#### Apothecary

##### Member

I have a LED flashlight that uses 3 D Cell NiMh batteries in series. Since the current must flow through all 3, I am wondering why ONE of them always seems to go dead before the others. All 3 are the same brand and capacity and age. All three are discharge capacity tested and are within 10% of each other.

I would think they would all discharge nearly uniformly, with their voltages all declining together. But that doesn't seem to be the case.

Is there some reason one of the three batteries in the series would carry more load than the other two?

As the charge becomes exhausted, I end up with the following.....

Battery 1 - 1.29v

Battery 2 - 1.29v

Battery 3 - .80v

I have marked the batteries and will begin noting the location of the battery which discharges first to see if it's the same battery each time and or the same position in the flashlight.

Thanks

I would think they would all discharge nearly uniformly, with their voltages all declining together. But that doesn't seem to be the case.

Is there some reason one of the three batteries in the series would carry more load than the other two?

As the charge becomes exhausted, I end up with the following.....

Battery 1 - 1.29v

Battery 2 - 1.29v

Battery 3 - .80v

I have marked the batteries and will begin noting the location of the battery which discharges first to see if it's the same battery each time and or the same position in the flashlight.

Thanks

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