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Thursday, 16 April 2026

The unsolved mystery of the electric bell that has been in operation for over 175 years

 Mobile phones are our lifeline in today’s world and we cannot live without them. And there is nothing more frustrating when the battery runs out at the most inopportune moment. But how long does a cell phone battery last?

Battery life is affected by many factors such as usage, weather, charge cycles, etc. For example, according to Apple, iPhone batteries are expected to last at least 500 full charge cycles, and if you charge your phone at least once every day, you will see a noticeable decrease in performance after 8 months, 16 months and 32 months.

Now let’s get to the burning question: can any battery last forever without recharging? The answer is yes, and it sits on a shelf in the lobby of the Clarendon Laboratory at the University of Oxford in the UK.

The device, officially known as the Clarendon Dry Pile, consists of a suspended metal ball that moves back and forth between two small bells. A ball hitting the bells makes a ringing sound. Even though it looks like a simple device, it is far from it.

More than 175 years after its manufacture, the Oxford electric bell (as it is often called) has rung over 10 billion times. And the secret lies in the battery that powers this device. No one has yet figured out the composition of the battery, and scientists are desperately waiting for it to run out to investigate its contents....<<<Read More>>>...