Why do batteries have to be replaced so often?

The lifespan of a battery is seriously affected by how it is used. Both the manufacturer and the user have ways to avoid or reduce ageing and damage.

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Given the amazing advances in so many aspects of car design, how come batteries still have such short lifespans? Is there a technical problem that cannot be solved? Or are the available solutions deliberately ignored by manufacturers? Dhon

It is technically possible to build a lead-acid battery in a way that is less prone to problems and will last much longer. It is also arithmetically certain that if batteries lasted twice as long there would be only half as many sales!

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Note: The results are not exact but very close to the actual.