Why don't all batteries drain at the same rate?

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Andy Terry

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Why don't all batteries drain at the same rate?
« on: 06/02/2011 18:30:03 »
Andy Terry asked the Naked Scientists:
   
When some of my battery powered items run out of power, I naturally replace the batteries with new ones.

If I test each "dead" battery with a meter I notice that some will be completely drained whereas others are still fully operational and can be re-used.

Obviously this only happens with items requiring more than one battery wired in series.

Why is this?

What do you think?
« Last Edit: 06/02/2011 18:30:03 by _system »

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Offline gora

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Why don't all batteries drain at the same rate?
« Reply #1 on: 11/02/2011 03:22:11 »
This is because when they are in series one dead/faulty battery is enough to break the circuit link and hence make the device go down.