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abating effect of battery


Guest bhuvaneshnick
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Guest bhuvaneshnick

why at the end of battery period.it giving 1 volt instead of it actually 1.5 volt.why the internal resistance increasing and voltage decreasing at end time of battery.thank you in advance

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Hello.

I have noticed that batteries start giving less and less voltage as they  deplete. I have a 9V battery, but it has been used for long periods of time to power my LED lamps. I notice that it's only giving off 3V when I suddenly realized that my 6V capacitors wouldn't blow up despited being connected to a 9V Battery.

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A disposable alkaline battery uses a chemical reaction to produce electricity. The chemicals get used up which causes the internal resistance to rise. Then there is a voltage divider with the load resistance.

After one year I replace the 9V battery in my smoke detector. The battery voltage measures about 8V or more without a load but drops very low with a load caused by the voltage divider action. 

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